Pressure Fittings, Adapters & Manifolds

Quick-test adapters, fittings, elbows, tees, manifolds, fluid traps, and Crystal CPF — the connection hardware that makes pressure calibration kits leak-tight and repeatable.

Why fittings matter

Most calibration delays come from leaks and mismatched threads, not from the gauge. Matched Quick-test / CPF hardware lets you rebuild a setup without wrenches and without damaging soft seals every time you change a UUT.

What we stock

• Quick-test adapters — hose-to-NPT, AN, tube, and process connections (Ralston QT/QTHA families).
• Elbows, tees, and manifolds — benchtop and field distribution of pressure.
• Fluid traps — protect gauges and controllers from liquid carryover.
• Crystal CPF — Crystal’s proprietary fitting system for many Crystal gauges and modules.
• Kits — common adapter assortments for field techs.

Popular fittings and adapters

• 37° flare (AN/JIC) — Ralston 37° flare (AN/JIC) Quick-connect Quick-test XT adapters, 37° flare (AN/JIC) male Quick-connect fittings and 37° AN flare hoses.
• NPT Quick-test — NPT male Quick-test adapters, NPT female Quick-test adapters, NPT female Quick-test gauge adapters and NPT male Quick-test XT adapters.
• Manifolds — Ralston QTCM brass calibration manifold, QSCM stainless steel calibration manifold, Ralston benchtop manifolds, Additel 121 pneumatic manifold and Additel 123 hydraulic manifold.
• Protection and kits — Ralston fluid & moisture traps, Quick-test hose & adapter kits, Quick-test valved fittings and Crystal CPF pressure fittings.

Frequently asked questions

Can Quick-test XT hoses connect to standard QTHA adapters?

No. Ralston specifies XTHA adapters for Quick-test XT hoses. Standard Quick-test hoses (to 6,900 psi) and Quick-test XT hoses (to 10,000 psi) each use their own adapter family.

How do I leave a permanent calibration port on a process line?

Use Ralston male NPT Quick-test fittings with cap and chain. The cap comes off to connect a Quick-test hose for calibration, then seals bubble-tight again when you're done.

What is Crystal CPF?

Crystal Pressure Fittings (CPF) are 316 stainless steel quick-test fittings with a patented o-ring plus metal-to-metal cone seal. They are finger-tight and leak-free to 10,000 psi (700 bar), with a self-venting weep hole and laser-marked MAWP.

Which manifold should I use to connect several gauges to one pressure source?

• Additel 121: a four-port pneumatic manifold, −15 to 3,600 psi, with a built-in filter. ADT121A variants go to 6,000 psi.
• Additel 123: a four-port hydraulic manifold, −15 to 15,000 psi.
• Ralston: QTCM (brass) and QSCM (stainless) calibration manifold kits.

How do I connect a male 37° flare (AN/JIC) fitting without a wrench?

The Ralston 37° flare (AN/JIC) Quick-connect Quick-test XT adapter, XTHA-2FSF-QD, connects to a male AN -4 flare fitting without a wrench and is rated to 15,000 psi (1,000 bar).

Pairing tip

Match the hose and adapter family to the pump and gauge on the product page. OEM-paired accessories are listed under Related products when we have datasheet-backed pairing.

More models in this category

• PIE Calibrator Accessories
• Ralston BSPP Female (RG) Quick-connect Adapters
• Ralston BSPP Female (RG) Quick-test Adapters: connect male BSPP (ISO 228) parallel thread ports to Quick-test hose — bonded seal ring, brass, up to 5,000 psi.
• Ralston BSPP Male (RS) Quick-test Adapters
• Ralston BSPP Male (RS) Quick-test Fittings: male BSPP Quick-test fittings with bonded seal ring and cap & chain for permanent Female BSPP process connections.
• Ralston BSPP Male (RS) Quick-test XT Adapters: BSPP male (RS) Quick-test XT adapters for metric process connections.
• Ralston BSPT Female (RT) Quick-test Adapters: connect male BSPT (ISO 7) taper thread ports to Quick-test hose — brass, up to 5,000 psi (not NPT-compatible).
• Ralston BSPT Male (RT) Quick-test Adapters
• Ralston BSPT Male (RT) Quick-test Fittings
• Ralston DP Transmitter Quick-test XT Adapters: Quick-test XT adapters for differential-pressure transmitter connections.
• Ralston NPT Female Quick-connect Adapters
• Ralston NPT Female Quick-connect x Quick-test XT Adapters: female NPT Quick-connect × male Quick-test XT — wrench-free gauge connect up to 15,000 psi.
• Ralston NPT Female Quick-test Bulkhead Unions: female NPT × male Quick-test bulkhead unions with cap & chain — seal through panels up to 0.5 in thick.
• Ralston NPT Female Quick-test XT Adapters: female NPT × male Quick-test XT adapters — connect male NPT gauges/devices to XT hose up to 10,000 psi.
• Ralston NPT Male Quick-connect Adapters
• Ralston NPT Male Quick-connect Fittings
• Ralston NPT Male Quick-test Fittings
• Ralston NPT Male Quick-test XT Fittings: male NPT × male Quick-test XT fittings with cap & chain — permanent install up to 10,000 psi.
• Ralston Quick-test 45° Elbows: Quick-test 45° elbow fittings for routing QT hose around obstacles.
• Ralston Quick-test 90° Elbows: Quick-test 90-degree elbows for compact gauge and adapter routing.
• Ralston Quick-test Bulkhead Connections: male Quick-test × male Quick-test bulkhead unions with cap & chain — seal through panels up to 0.5 in thick.
• Ralston Quick-test Tees: Quick-test tee fittings for branching Quick-test hose connections.
• Ralston Quick-test XT Bulkhead Connections: Quick-test XT bulkhead unions for panel-mount high-pressure connections.
• Ralston Quick-test XT Tees: Quick-test XT tee fittings for branching high-pressure QT XT hose runs.
• Ralston Quick-test XT Unions: Quick-test XT union fittings for joining Quick-test XT hose sections.
• Ralston Tube Fitting Quick-test Bulkhead Unions: tube fitting × male Quick-test bulkhead unions with cap & chain — seal through panels up to 0.5 in thick.
• Ralston Tube Fitting Quick-test XT Adapters: 1/4 in tube fitting × male Quick-test XT — bubble-tight wrench-free to 15,000 psi.
• Ralston Quick-test USN Hoses & Adapters

Note

Fittings are typically not ISO/IEC 17025 calibrated; calibrate the gauge or calibrator in the loop.