Dependable, leak-free connections for air and light fluid lines. The Foster BL2302S/S is a 303 Stainless 1/8″ coupler from the proven Foster 2 Series — a miniature, high-flow quick coupler only 5/8″ in diameter (socket ~1 oz) that interchanges with Foster 1/8″ 2 Series plugs. Built in the USA for shops, hobbyists, and OEMs that need a compact coupler without giving up flow or durability.
Specifications
- Brand: Foster
- Series: 2
- Part Number: BL2302S/S
- Interchange: 1/8″ Industrial
- Body: 1/8″ Coupler, Manual
- Thread: 1/8″ Female NPT, FPT
- Valve Type: One-Way Shut-Off
- Material: 303 Stainless
- Working Pressure: 300 PSIG; vacuum to 27″ Hg
- Temperature Range: -40°F to +250°F (Buna-N)
- Seal: Buna-N (Nitrile)
- Quantity: 1pc
- Origin: Made in USA
Why this coupler
- 303 stainless construction — which means superior corrosion resistance for washdown, marine, and chemical environments.
- Stainless ball locking — which means a large number of captive balls spread the load for positive, swiveling connections that resist wear and reduce hose torque.
- Ball Lock option — which means the sleeve rotates to lock after connection, guarding against accidental disconnect and hose-whip.
- Precision leak-proof seal — which means bubble-tight performance within the rated working pressure.
- 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 — no drips, no hiss, no fighting a stuck sleeve. Drop it into a tight panel or a crowded bench and the compact 5/8″ body stays out of the way while still flowing like a larger coupler.
Frequently asked questions
What does this connect to?
It mates with any Foster 1/8″ 2 Series plug of the same body size. The 1/8″ 2 Series is Foster’s miniature industrial profile.
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 (Buna-N).
Is this air coupler fuel-rated?
No — the 2 Series is a miniature air/fluid coupler for compressed air, water, and similar low-pressure media; it is not rated for fuel.
How does it connect?
The 2 Series socket uses a manual pull sleeve — retract the sleeve by hand to connect or release the plug. The socket is valved (one-way shut-off), so install it on the pressure side; the supply line seals when the plug is removed.
Ideal for lightweight, low-flow applications — airbrushes, small pneumatic systems, hobby and craft tools, instrument air, and compact shop setups. Pair this coupler with a matching Foster 1/8″ 2 Series plug for a complete, leak-free connection.
Why buy from hpcouplers: Made in the USA by Foster Manufacturing (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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