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Ralston Fittings and Adapters

Ralston Fittings and Adapters

Ralston Instruments Fittings and AdaptersRalston Instruments Fittings and Adapters

Precision Fittings and Adapters for Reliable Pressure Testing and Calibration

Ralston Instruments Fittings and Adapters, available through Transcat, offer industry-leading precision and durability for professionals working with pressure systems. Designed to ensure leak-free connections in even the most demanding applications, these fittings and adapters are essential tools for technicians performing pressure calibration, testing, and fluid transfer. With a wide range of configurations and materials, Ralston’s fittings and adapters provide seamless compatibility with gas, hydraulic, and pneumatic systems across various industries.

Leak-Free Performance

Ralston’s fittings and adapters are engineered for tight, secure, and reliable connections, eliminating the risk of leaks that can compromise accuracy during pressure testing or calibration. Each component undergoes rigorous testing to ensure consistent performance in critical applications.

Durable, Corrosion-Resistant Materials

Constructed from high-grade stainless steel, brass, and other corrosion-resistant materials, Ralston fittings and adapters are built for longevity, even in harsh environments. These materials ensure resistance to wear, corrosion, and impact, extending the life of your equipment.

High-Pressure Tolerance

Ralston fittings and adapters are designed to handle both low-pressure and high-pressure environments, making them suitable for everything from routine calibration to high-stakes testing in gas and fluid systems. They are built to withstand pressure levels up to 5000 PSI and beyond, ensuring they meet the toughest requirements.

Wide Range of Configurations

Available in a broad spectrum of sizes, thread types, and connection styles—including NPT, BSPP, and Quick-Test™—Ralston fittings and adapters are compatible with virtually any system. This versatility makes them ideal for a variety of industries, including energy, aerospace, and industrial manufacturing.

 

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Showing 1-25 of 247
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  1. Ralston XTHA-FRS0 DP Transmitter Adapter, 5/16" - 24 UNF x male Quick-test adapter, S.S
    Ralston Instruments XTHA-FRS0 DP Transmitter Adapter, 5/16" -24 UNF x male Quick-test Adapter DP Transmitter Adapter,5/16"-24 UNFxmale Quick-test Adapter,S.
    Order #: XTHA-FRS0
    Mfg #: XTHA-FRS0
    Availability: In stock
    $76.37
    DP Transmitter Adapter,5/16"-24 UNFxmale Quick-test Adapter,S. Learn More
  2. Ralston XTFT-HNS0 1/4"-28 UNF DP Transmitter x Male Fitting
    Ralston Instruments XTFT-HNS0 1/4" -28 UNF DP Transmitter x Male QT XT Fitting with Cap & Chain 1/4"-28 UNF DP Transmitter x Male QT XT Fitting w/Cap &Chain
    Order #: XTFT-HNS0
    Mfg #: XTFT-HNS0
    Availability: In stock
    $115.62
    1/4"-28 UNF DP Transmitter x Male QT XT Fitting w/Cap &Chain Learn More
  3. Ralston Instruments QTFT-PLGS SS Quick-test Hose Plug & Chain only
    Ralston Instruments QTFT-PLGS Stainless Steel Quick-test Hose Plug & Chain only SS Quick-test Hose Plug & Chain only
    Order #: QTFT-PLGS
    Mfg #: QTFT-PLGS
    Availability: In stock
    $35.04
    SS Quick-test Hose Plug & Chain only Learn More
  4. Ralston Instruments QTHA-3MS0-QD
    Ralston Instruments QTHA-3MS0-QD 3/8" Male NPT Quick-connect x Male Quick-test, Stainless Steel adapter 3/8" Male NPT Quick-connect x Male Quick-test, S.S
    Order #: QTHA-3MS0-QD
    Mfg #: QTHA-3MS0-QD
    Availability: In stock
    $110.88
    3/8" Male NPT Quick-connect x Male Quick-test, S.S Learn More
  5. Ralston QTHA-3FSF-QD 3/8" female 37 degree flare x male Quick-test adapter
    Ralston Instruments QTHA-3FSF-QD 3/8" Female 37 degree Flare x Male Quick-test Adapter, Stainless Steel adapter 3/8"Female 37 degree Flare x Male Quick-test Adapter,SS
    Order #: QTHA-3FSF-QD
    Mfg #: QTHA-3FSF-QD
    Availability: Ships in 1-2 weeks
    $119.43
    3/8"Female 37 degree Flare x Male Quick-test Adapter,SS Learn More
  6. Ralston Instruments QTHA-2MS0-C580-QD CGA580 Quick-connect x 1/4" Male NPT Adapter, Stainless Steel
    Ralston Instruments QTHA-2MS0-C580-QD CGA580 Quick-connect x 1/4" Male NPT Adapter, Stainless Steel CGA580 Quick-connect x 1/4"Male NPT Adapter,SS
    Order #: QTHA-2MS0-C580-QD
    Mfg #: QTHA-2MS0-C580-QD
    Availability: In stock
    $189.78
    CGA580 Quick-connect x 1/4"Male NPT Adapter,SS Learn More
  7. Ralston Instruments QTHA-1FS0-QD
    Ralston Instruments QTHA-1FS0-QD 1/8" Female NPT Quick-connect x Male Quick-test, no Check-valve Adapter 1/8"Female NPT Quick-connect x Male Quick-test,no Check-valve
    Order #: QTHA-1FS0-QD
    Mfg #: QTHA-1FS0-QD
    Availability: In stock
    $69.76
    1/8"Female NPT Quick-connect x Male Quick-test,no Check-valve Learn More
  8. Ralston Instruments QTHA-CMS0-C580-QD CGA580 Quick-connect Male x Quick-test, no Check-valve, Stainless Steel Adapter
    Ralston Instruments QTHA-CMS0-C580-QD CGA580 Quick-connect Male x Quick-test, no Check-valve, Stainless Steel Adapter CGA580 Quick-connect Male x Quick-test,no Check-valve,SS
    Order #: QTHA-CMS0-C580-QD
    Mfg #: QTHA-CMS0-C580-QD
    Availability: In stock
    $147.41
    CGA580 Quick-connect Male x Quick-test,no Check-valve,SS Learn More
  9. Ralston Instruments QTHA-6MB0 3/4" Male NPT x Male Quick-test, no Check-valve, Brass Adapter
    Ralston Instruments QTHA-6MB0 3/4" Male NPT x Male Quick-test, no Check-valve, Brass Adapter 3/4"Male NPT x Male Quick-test no Check-valve,Brass
    Order #: QTHA-6MB0
    Mfg #: QTHA-6MB0
    Availability: In stock
    $64.47
    3/4"Male NPT x Male Quick-test no Check-valve,Brass Learn More
  10. Ralston Instruments QTFT-1MS0
    Ralston Instruments QTFT-1MS0 1/8" Male NPT x Male Quick-test, no Check-valve with Cap & Chain, Stainless Steel Adapter 1/8"Male NPT x Male Quick-test no Check-valve w/Cap & Chain,SS
    Order #: QTFT-1MS0
    Mfg #: QTFT-1MS0
    Availability: In stock
    $46.90
    1/8"Male NPT x Male Quick-test no Check-valve w/Cap & Chain,SS Learn More
  11. Ralston Instruments SWIV-2FBW 1/4" Female NPT swivel, Brass
    Ralston Instruments SWIV-2FBW 1/4" Female NPT swivel, Brass 1/4" Female NPT swivel, brass
    Order #: SWIV-2FBW
    Mfg #: SWIV-2FBW
    Availability: In stock
    $18.52
    1/4" Female NPT swivel, brass Learn More
  12. Ralston Instruments QTQT QT Hose, Brass Hose Ends, 1' Hose
    Ralston Instruments QTQT QT Hose, Brass Hose Ends, 1' Hose QT Hose,Brass Hose Ends,1'Hose
    Order #: QTQT-HOS1
    Mfg #: QTQT-HOS-1FT
    Availability: In stock
    $52.31
    QT Hose,Brass Hose Ends,1'Hose Learn More
  13. Ralston Instruments QTHA-4MB1 1/2" Male NPT x Male QT with Check- valve, Brass Adapter
    Ralston Instruments QTHA-4MB1 1/2" Male NPT x Male QT with Check- valve, Brass Adapter 1/2"Male NPT x Male QT w/Check- valve, Brass
    Order #: QTHA-4MB1
    Mfg #: QTHA-4MB1
    Availability: In stock
    $31.39
    1/2"Male NPT x Male QT w/Check- valve, Brass Learn More
  14. Ralston Instruments QTHA-4FS0 1/2" Female NPT x Male Quicktest No Check-valve, Stainless Steel Adapter
    Ralston Instruments QTHA-4FS0 1/2" Female NPT x Male Quicktest No Check-valve, Stainless Steel Adapter 1/2"Female NPT x Male Quicktest No Check-valve,S.S
    Order #: QTHA-4FS0
    Mfg #: QTHA-4FS0
    Availability: In stock
    $59.14
    1/2"Female NPT x Male Quicktest No Check-valve,S.S Learn More
  15. Ralston Instruments QTHA-4FSA-QD 1/2" FNPT x Quick Disconnect x Male QT, Stainless Steel, no check valve Adapter
    Ralston Instruments QTHA-4FSA-QD 1/2" FNPT x Quick Disconnect x Male QT, Stainless Steel, no check valve Adapter 1/2"FNPT x Quick Disconnect x Male QT,SS,no check valve
    Order #: QTHA-4FSA-QD
    Mfg #: QTHA-4FSA-QD
    Availability: In stock
    $122.94
    1/2"FNPT x Quick Disconnect x Male QT,SS,no check valve Learn More
  16. Ralston Instruments QTHA-3SB1 Male Quick-test with Check Valve, Brass
    Ralston Instruments QTHA-3SB1 Male Quick-test with Check Valve, Brass Male Quick-test with Check Valve, Brass
    Order #: QTHA-3SB1
    Mfg #: QTHA-3SB1
    Availability: In stock
    $19.65
    Male Quick-test with Check Valve, Brass Learn More
  17. Ralston Instruments QTHA-3SB0 Male Quick-Test, Brass
    Ralston Instruments QTHA-3SB0 Male Quick-Test, Brass Male Quick-Test, Brass
    Order #: QTHA-3SB0
    Mfg #: QTHA-3SB0
    Availability: In stock
    $13.12
    Male Quick-Test, Brass Learn More
  18. Ralston Instruments QTHA-3MS0 3/8" Male NPT Male Quick-test Stainless Steel Adapter
    Ralston Instruments QTHA-3MS0 3/8" Male NPT Male Quick-test Stainless Steel Adapter 3/8" Male NPT Male Quick-test SS
    Order #: QTHA-3MS0
    Mfg #: QTHA-3MS0
    Availability: In stock
    $43.71
    3/8" Male NPT Male Quick-test SS Learn More
  19. Ralston Instruments QTHA-2MB1 1/4" male NPT x male QT, with check-valve, Brass Adapter
    Ralston Instruments QTHA-2MB1 1/4" male NPT x male QT, with check-valve, Brass Adapter 1/4" male NPT x male QT, with check-valve, brass
    Order #: QTHA-2MB1
    Mfg #: QTHA-2MB1
    Availability: In stock
    $19.29
    1/4" male NPT x male QT, with check-valve, brass Learn More
  20. Ralston Instruments QTHA-2MB0-RT 1/4" Male BSPT (ISO 7/1) x Male QT, No Check-valve, Brass Adapter
    Ralston Instruments QTHA-2MB0-RT 1/4" Male BSPT (ISO 7/1) x Male QT, No Check-valve, Brass Adapter 1/4"Male BSPT(ISO 7/1)xMale QT, No Check-valve,Brass
    Order #: QTHA-2MB0-RT
    Mfg #: QTHA-2MB0-RT
    Availability: In stock
    $21.16
    1/4"Male BSPT(ISO 7/1)xMale QT, No Check-valve,Brass Learn More
  21. Ralston Instruments QTHA-2FB0-RG G 1/4" female BSPP (ISO 228/1) x male QT, no check-valve, Brass Adapter
    Ralston Instruments QTHA-2FB0-RG G 1/4" female BSPP (ISO 228/1) x male QT, no check-valve, Brass Adapter G 1/4" female BSPP (ISO 228/1)x male QT, no check-valve, brass
    Order #: QTHA-2FB0-RG
    Mfg #: QTHA-2FB0-RG
    Availability: In stock
    $25.78
    G 1/4" female BSPP (ISO 228/1)x male QT, no check-valve, brass Learn More
  22. Clearance
    Ralston Instruments QTHA-1MS1 1/8" MNPTx male QT with Check-valve Stainless Steel Adapter
    Ralston Instruments QTHA-1MS1 1/8" MNPTx male QT with Check-valve Stainless Steel Adapter 1/8"MNPTx male QT w/Check-valve SS
    Order #: QTHA-1MS1
    Mfg #: QTHA-1MS1
    Availability: In stock
    Special Price $20.92 Regular Price $44.85
    1/8"MNPTx male QT w/Check-valve SS Learn More
  23. Ralston Instruments QTHA-1MSA 1/8" Male NPT x Female QT, no check valve, 300 series Stainless Steel Adapter
    Ralston Instruments QTHA-1MSA 1/8" Male NPT x Female QT, no check valve, 300 series Stainless Steel Adapter 1/8"Male NPT x Female QT,no check valve,300 series SS
    Order #: QTHA-1MSA
    Mfg #: QTHA-1MSA
    Availability: In stock
    $49.50
    1/8"Male NPT x Female QT,no check valve,300 series SS Learn More
  24. Ralston Instruments QTHA-1MB1 1/8" Male NPT x Male QT with Check- valve, Brass Adapter
    Ralston Instruments QTHA-1MB1 1/8" Male NPT x Male QT with Check- valve, Brass Adapter 1/8"Male NPT x Male QT w/Check- valve,Brass
    Order #: QTHA-1MB1
    Mfg #: QTHA-1MB1
    Availability: In stock
    $19.50
    1/8"Male NPT x Male QT w/Check- valve,Brass Learn More
  25. Ralston Instruments QTHA-1MB0-RS 1/8" Male BSPP (ISO 228/1) x Male QT, no Check valve, Brass Adapter
    Ralston Instruments QTHA-1MB0-RS 1/8" Male BSPP (ISO 228/1) x Male QT, no Check valve, Brass Adapter 1/8"Male BSPP(ISO 228/1)x Male QT, no Check valve,Brass
    Order #: QTHA-1MB0-RS
    Mfg #: QTHA-1MB0-RS
    Availability: In stock
    $19.98
    1/8"Male BSPP(ISO 228/1)x Male QT, no Check valve,Brass Learn More
Showing 1-25 of 247
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Don’t forget about these!

  1. Monster High - Howliday Cleo de Nile Winter Edition Doll

    Monster High - Howliday Cleo de Nile Winter Edition Doll

    This Monster High doll is the gift that keeps on giving! Cleo De Nile lights up the howlidays in a radiant golden gown and shimmery shawl. She sparkles like the fright of the season herself in a gleaming headdress, faboolous fringe, and sculptural heels. Featuring majestic packaging worthy of a pharaoh, this Winter Edition Howliday collectible is a perfect keepsake for skelebrating the most festive time of year!

    • Ghoulish Greetings! Wrapped up like a mummified present in dazzling fabric, this Winter Edition Cleo De Nile Howliday doll shines brighter than the stars glittering in the sky!
    • It’s the night of the winter solstice, and Cleo De Nile sparkles with all the scary brightness of the season in her satiny dress and pleated organza overskirt.
    • A gleaming “feather” and bow headdress crowns her sparkling, tinsel-strewn hair. Elegant snake details on her collar and belt complement this statement headpiece!
    • Her snowflake-dusted shawl glides behind her with gore-geous grace, the fringe swishing above her Anubis heels on the dance floor.
    • Monster High wishes everyone a scary and bright howliday season! Explore the whole doll skullection for more scary-good gift ideas.

    Another awesome Monster High collectible, proudly brought to you by Popcultcha! Check out our full Monster High collection here.

    As low as $99.99
  2. Monster High - The Hissfits: Toralei Stripe, Meowlody & Purrsephone Doll 3-Pack

    Monster High - The Hissfits: Toralei Stripe, Meowlody & Purrsephone Doll 3-Pack

    The Hissfits are the most furr-ocious band at Monster High! Toralei Stripe, Meowlody and Purrsephone dolls look gorgeously glam in fashions that are beyond fierce. These three Monster High dolls are ready to rock with 30+ performance-themed pieces like backstage snacks, beauty essentials and fan merch. Kids and collectors 4 years old and up will love jamming out monster-style with the Hissfits!

    • ​These three Monster High dolls give off major mon-star energy with clawsome rock 'n roll fashions, two guitars, backstage accessories and spooktacular merch for the fans!
    • ​Toralei Stripe doll looks pawsitively purrfect in a purple romper with a sheer skirt overlay. Studded shoulder pieces, a fierce cage skirt and scary-cool ombre boots complete the outfit.
    • ​Since her bandmates Meowlody and Purrsephone are twin werecats, they rock-coordinated pop-punk looks that feature layered tops, faux leather fabrics, stockings, and chunky boots!
    • ​The Hissfits come with rocker-glam beauty essentials to help them get ready backstage: a makeup storage kit, eye shadow pallet, glitter compact, eyeliners, lipstick, brush and more.
    • ​A microphone and two guitars with removable straps help the werecats slay on stage! One of the dolls can even wear the included faux fur scarf for an extra furr-ocious performance.

    Another awesome Monster High collectible, proudly brought to you by Popcultcha! Check out our full Monster High collection here.

    As low as $199.99
  3. Moriah Elizabeth - Mystery Hanger Plush Series 2 Blind Bag Plush (Single Unit)

    Moriah Elizabeth - Mystery Hanger Plush Series 2 Blind Bag Plush (Single Unit)

    Moriah Elizabeth, the popular craft YouTuber, is known for her interactive art and craft videos, and adorable collection of characters! Now you can take your favorite Moriah Elizabeth characters with you on the go – with the new hanger plush collection!

    The new collection of mystery hanger plush includes characters from Moriah’s content including Harold, Martin, Oliver, Candy, Jenny, and Nikki!

     A Moriah Elizabeth Mystery Hanger Plush is the perfect gift for Moriah fans, art and craft lovers, collectors, and more!

    Proudly brought to you by Popcultcha - to see the full range of our Blind Box goodies, please click here.

    As low as $8.99
  4. Monster High x Wednesday (2022) - Enid Sinclair Doll

    Monster High x Wednesday (2022) - Enid Sinclair Doll

    Monster High meets Nevermore Academy in this spooky new collab’ between Wednesday & Mattel!

    The Enid Sinclair Monster High doll looks colourful and iclawnic in a pink ensemble, yellow sneakers and creepy cute backpack. As endearing in doll form as she is on the show, Enid is ready for anything -- whether it’s getting the tea on school gossip or fighting off a homicidal monster! 

    • Accessories include signature beret and backpack 
    • Packaged in her dorm room environment. When displayed next to our Wednesday Addams doll, both sides of the dorm room are featured 

    Note: Doll cannot stand alone. Doll stand included

    Proudly brought to you by Popcultcha, your one-stop shop for Wednesday collectibles, any day of the week. Check out our full collection here!

    As low as $99.99
  5. Monster High x Wednesday (2022) - Rave'N Dance Wednesday Addams Doll

    Monster High x Wednesday (2022) - Rave'N Dance Wednesday Addams Doll

    Monster High meets Nevermore Academy in this spooky new collab’ between Wednesday & Mattel!

    Inspired by a dance scene in the show that quickly went viral, the Rave’N Wednesday doll is drop dead gore-geous in a sheer layered gown. With her ruffled skirt and boo-spoke heels featuring icicles and yetis, she’s set to hit the dance floor like a ghoul possessed.

    Note: Doll cannot stand alone. Doll stand included

    Proudly brought to you by Popcultcha, your one-stop shop for Wednesday collectibles, any day of the week. Check out our full collection here!

    As low as $149.99
  6. Moriah Elizabeth - Mystery Hanger Plush Series 2 Blind Bag Plush (Display of 18)

    Moriah Elizabeth - Mystery Hanger Plush Series 2 Blind Bag Plush (Display of 18)

    Moriah Elizabeth, the popular craft YouTuber, is known for her interactive art and craft videos, and adorable collection of characters! Now you can take your favorite Moriah Elizabeth characters with you on the go – with the new hanger plush collection!

    The new collection of mystery hanger plush includes characters from Moriah’s content including Harold, Martin, Oliver, Candy, Jenny, and Nikki!

     A Moriah Elizabeth Mystery Hanger Plush is the perfect gift for Moriah fans, art and craft lovers, collectors, and more!

    Proudly brought to you by Popcultcha - to see the full range of our Blind Box goodies, please click here.

    As low as $139.99
  7. Squishmallows - Shon the Loch Ness Monster 12" Plush

    Squishmallows - Shon the Loch Ness Monster 12" Plush

    Squishmallows are the adorably soft, marshmallow-like plushies that you need in your life. Made by Kellytoys to be the most huggable cuddle buddies around, they’re even machine washable to ensure they’re always ready for a long flight or road trip. 

    Shon coaches the football team at her local elementary school. All students are invited to try out and give it their best effort! Shon focuses on discipline and good sportsmanship in each practice, and most of all, having fun. She hopes to see you at next season's tryout!

    Proudly brought to you by Popcultcha, Australia's largest and most comprehensive Squishmallows online store. Click here to see the full range of our super cuddly Squishmallows from Kellytoy!

    As low as $19.99
  8. Squishville - Fashion Pack with Miles the Dragon & Lindsay the Leopard Mini Squishmallows 2” Plush 2-Pack

    Squishville - Fashion Pack with Miles the Dragon & Lindsay the Leopard Mini Squishmallows 2” Plush 2-Pack

    Welcome to the Squishville plush toy world, home of the Squishmallows!. This all-new world features your favorite Squishmallow plush characters in a brand new 2-inch size. There are playsets, vehicles, mini-Squishmallows plush characters (of course), and more in this adorably squishy collection. So call your squad and squeeze in because once you leave, you’ll squish you were here!

    Get ready for the adventure of a lifetime with the Squishville plush world’s mini-Squishmallow plush 2 Pack Assortment. This adorably squishy 2 pack assortment features your favorite Squishmallows plush characters in a mini 2-inch size. These mini-Squishmallow plush besties each come with a fashion accessory that they squeeze into. Mix and match fashions with the Mini-Squishmallow plush besties and every 2-inch mini-Squishmallow plush in your squishy world

    Brought to you by Popcultcha and Cultcha Kids, Australia's largest collectables, and newest Kid-lectables, website. CLICK HERE to check out our great range of Plush toys.

    As low as $14.99
  9. Dungeons & Dragons - Deluxe NanoFig Die-Cast Figure 7-Pack

    Dungeons & Dragons - Deluxe NanoFig Die-Cast Figure 6-Pack

    Authentically licensed product from Dungeons & Dragons. Crafted from durable materials such as 100% die-cast metal and premium metallic paints, the quality of these figures is undeniable. Standing at about 1.65" and weighing approximately 30g. Highly collectible figures included in this mega pack, mix and match the different characters from Dungeons & Dragons. MetalFig's high-end casting method allows Jada to capture the styling, posing, and unique quality's to various Dungeons & Dragons characters.

    Contents:

    • Young Blue Dragon figure
    • Drow Elf figure
    • Ogre figure
    • Beholder figure
    • Human Barbarian figure
    • Iron Golem figure
    • Dwarf Cleric figure

    Proudly brought to you by Popcultcha, Australia's largest and most comprehensive Jada Toys online store. Click here to see more great JADA Toys products.

    As low as $69.99
  10. Demon Slayer - Nezuko Kamado MP Mascot 3.5" Plush

    Demon Slayer - Nezuko Kamado MP Mascot 3.5" Plush

    Joining the Plushie Charm line is Nezuko Kamado from the hit anime series Demon Slayer: Kimetsu No Yaiba. This plush is perfect for accessories decoration!  

    This Nezuko Kamado plush is made from incredibly soft materials to ensure it’s perfect for cuddling when it’s not sitting aesthetically among the rest of your anime collection.

    Measuring at 3.5 inches in height, it’s a great way to show your love for your favourite Demon Slayer!

    Brought to you by Popcultcha, Australia's largest and most comprehensive Manga/anime figure online store. Click here to see the full range of our merchandise.

    As low as $14.99