Reliable, leak-free 1/2″ connections for high-flow air and fluid lines. The Foster 81-5 is a Steel 1/2″ industrial plug from the Foster 5 Series — a high-flow quick coupler that interchanges with any 1/2″-body industrial-interchange half (ISO 6150-B / ANSI T3.20.14; FM 5 Series complies with A-A-59439). Built in the USA for demanding shop air, tools, and production lines.
Specifications
- Brand: Foster
- Series: 5
- Part Number: 81-5
- Interchange: 1/2″ Industrial
- Body: 1/2″ Plug
- Thread: 1/2″ Push-On Hose Stem
- Valve Type: One-Way Shut-Off
- Material: Steel
- Operation: One-Way Shut-Off plug (un-valved; mates with valved socket)
- Working Pressure: 300 PSIG; vacuum to 27″ Hg
- Temperature Range: -40°F to +250°F
- Seal: Buna-N (Nitrile)
- Quantity: 1pc
- Origin: Made in USA
Why this plug
- Steel construction — which means it withstands repeated high-pressure cycling without deforming.
- One-Way Shut-Off — which means the socket seals the supply line the instant the plug is removed, holding pressure and preventing blow-down.
Snap it on and the connection just holds — full 1/2″ flow, no drips, no hiss. Built to take daily shop abuse and keep sealing leak-free, connection after connection.
Frequently asked questions
What does this connect to?
It mates with any 1/2″-body industrial-interchange coupler (ISO 6150-B / ANSI T3.20.14), the most common high-flow air-coupler standard in North America.
What pressure and temperature is it rated for?
300 PSIG working pressure (vacuum to 27″ Hg connected), with a Buna-N (Nitrile) seal rated -40°F to +250°F.
Is this air coupler fuel-rated?
No — the 5 Series is an industrial air/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.
Ideal for high-flow shop air lines, pneumatic tools, and production equipment. Pair this plug with a matching 1/2″ 5 Series coupler for a complete, leak-free connection.
Why buy from hpcouplers: Foster quality (an Ideal Tridon Group brand), backed by responsive US-based support, accurate specs, and fast shipping. Quick-coupling is what we do.
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