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Connect Automotive / Tru-Flate T-style air coupler to 1/4" NPT (National Pipe Taper)

How to join 1/4" Automotive (Type T) and 1/4-18 NPT, and what stops it leaking.

Needs adapter
End A
Automotive / Tru-Flate T-style air coupler (1/4" Automotive (Type T))
Seals on the ball detent when the collar releases
via adapter
End B
1/4" NPT (National Pipe Taper) (1/4-18 NPT)
Seals on on the thread flanks with PTFE tape
Adapter needed1/4 NPT air coupler on a 1/4 NPT port

Not a direct fit. Joining Automotive / Tru-Flate T-style air coupler to 1/4" NPT (National Pipe Taper) needs a 1/4 NPT air coupler on a 1/4 NPT port.

The part to buy

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US automotive air couplers usually mount on a 1/4 NPT port, sealing on the tapered thread with PTFE tape. As with any coupler, the NPT thread only handles the mount; the Tru-Flate T-style front still has to match the plug you use. Confirm both.

Tape the NPT mount thread only. The quick-connect front seals mechanically, not with tape, so wrapping the coupling nose does nothing but foul the seal.

Related connections

Automotive / Tru-Flate T-style air coupler1/4" Automotive (Type T)1/4" NPT (National Pipe Taper)1/4-18 NPTIndustrial / Milton M-style air coupler to Automotive / Tru-Flate T-style air couplernot compatible

Sources: Air line couplers and plugs interchange guide, ToolGuyd · Common pneumatic quick-connect interchange profiles (Milton, ARO, Euro, Orion), XHnotion · ANSI/ASME B1.20.1 (NPT pipe threads) · NPT thread dimensions chart (ASME B1.20.1), Machining Doctor