Reliable, leak-free 3/8″ connections for air and fluid lines. The Foster 4504S is a Brass body, Brass sleeve, SS valve 3/8″ industrial coupler from the Foster 4 Series — a high-flow quick coupler that interchanges with any 3/8″-body industrial-interchange half (ISO 6150-B / ANSI T3.20.14). Built in the USA for shop air, tools, and production lines that demand dependable, high-flow connect/disconnect.
Specifications
- Brand: Foster
- Series: 4
- Part Number: 4504S
- Interchange: 3/8″ Industrial
- Body: 3/8″ Coupler
- Thread: 1/2″ Male NPT, MPT
- Valve Type: One-Way Shut-Off
- Material: Brass body, Brass sleeve, SS valve
- Operation: Manual pull sleeve to connect
- Working Pressure: 300 PSIG; vacuum to 27″ Hg
- Temperature Range: -40°F to +300°F
- Seal: Ethylene Propylene (EPDM)
- Quantity: 1pc
- Origin: Made in USA
Why this coupler
- Manual pull sleeve — which means a positive, deliberate connection; retract the sleeve by hand to connect or release the plug.
- Brass construction — which means corrosion resistance and smooth, reliable operation.
- EPDM seal — which means compatibility with steam service.
- 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 3/8″ 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 3/8″-body industrial-interchange plug (ISO 6150-B / ANSI T3.20.14) — the most common 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 Ethylene Propylene (EPDM) seal.
Is this air coupler fuel-rated?
No — the 4 Series is an industrial air/fluid coupler for compressed air, water, and similar media; it is not rated for fuel.
Ideal for shop air lines, pneumatic tools, impact wrenches, and production equipment. Pair this coupler with a matching 3/8″ 4 Series plug 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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