

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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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 Special Price $114.55 Regular Price $114.56DP Transmitter Adapter,5/16"-24 UNFxmale Quick-test Adapter,S. Learn More -
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 $173.431/4"-28 UNF DP Transmitter x Male QT XT Fitting w/Cap &Chain Learn More -
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 $52.56SS Quick-test Hose Plug & Chain only Learn More -
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 $166.323/8" Male NPT Quick-connect x Male Quick-test, S.S Learn More -
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: In stock Special Price $179.14 Regular Price $179.153/8"Female 37 degree Flare x Male Quick-test Adapter,SS Learn More -
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 $284.67CGA580 Quick-connect x 1/4"Male NPT Adapter,SS Learn More -
Ralston Instruments QTHA-2FSA 1/4" Female NPT x Female Quick-test, no Check-valve, Stainless Steel Adapter 1/4"FemaleNPTxFemale Quick-test no Check-valve,SS
Order #: QTHA-2FSA Mfg #: QTHA-2FSA Availability: In stock Special Price $78.55 Regular Price $78.561/4"FemaleNPTxFemale Quick-test no Check-valve,SS Learn More -
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 $104.641/8"Female NPT Quick-connect x Male Quick-test,no Check-valve Learn More -
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 Special Price $221.11 Regular Price $221.12CGA580 Quick-connect Male x Quick-test,no Check-valve,SS Learn More -
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 Special Price $96.70 Regular Price $96.713/4"Male NPT x Male Quick-test no Check-valve,Brass Learn More -
Ralston Instruments QTFT-3MB0 3/8" Male NPTxMale Quick-test, no Check-valve with Cap & Chain, Brass Adapter 3/8"Male NPTxMale Quick-test no Check-valve w/Cap&Chain,Brass
Order #: QTFT-3MB0 Mfg #: QTFT-3MB0 Availability: In stock $53.733/8"Male NPTxMale Quick-test no Check-valve w/Cap&Chain,Brass Learn More -
Ralston Instruments QTFT-2MS0 1/4" Male NPT x Male Quick-test, no Check-valve with Cap & Chain, Stainless Steel Adapter 1/4"Male NPT x Male Quick-test no Check-valve w/Cap & Chain,SS
Order #: QTFT-2MS0 Mfg #: QTFT-2MS0 Availability: In stock $67.321/4"Male NPT x Male Quick-test no Check-valve w/Cap & Chain,SS Learn More -
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 $70.351/8"Male NPT x Male Quick-test no Check-valve w/Cap & Chain,SS Learn More -
Ralston Instruments QTHA 3/8" NPTF x Quick-test Male, No Check-valve, Brass Connector Adapter 3/8"NPTF x Quick-test Male,No Check-valve,Brass Connector
Order #: QTHA-3FB0 Mfg #: QTHA-3FB0 Availability: In stock $48.633/8"NPTF x Quick-test Male,No Check-valve,Brass Connector Learn More -
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 $27.781/4" Female NPT swivel, brass Learn More -
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 Special Price $78.46 Regular Price $78.47QT Hose,Brass Hose Ends,1'Hose Learn More -
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 Special Price $47.08 Regular Price $47.091/2"Male NPT x Male QT w/Check- valve, Brass Learn More -
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 $88.711/2"Female NPT x Male Quicktest No Check-valve,S.S Learn More -
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 $184.411/2"FNPT x Quick Disconnect x Male QT,SS,no check valve Learn More -
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 Special Price $29.47 Regular Price $29.48Male Quick-test with Check Valve, Brass Learn More -
Ralston Instruments QTHA-3SB0 Male Quick-Test, Brass Male Quick-Test, Brass
Order #: QTHA-3SB0 Mfg #: QTHA-3SB0 Availability: In stock $19.68Male Quick-Test, Brass Learn More -
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 Special Price $65.56 Regular Price $65.573/8" Male NPT Male Quick-test SS Learn More -
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 Special Price $28.93 Regular Price $28.941/4" male NPT x male QT, with check-valve, brass Learn More -
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 $31.741/4"Male BSPT(ISO 7/1)xMale QT, No Check-valve,Brass Learn More -
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 $38.67G 1/4" female BSPP (ISO 228/1)x male QT, no check-valve, brass Learn More