Foster SL4604, 3/8" Industrial Coupler x 1/4" Hose ID, 4 Series, Automatic Sleeve Lock, Brass
Reliable, leak-free 3/8" connections for air and fluid lines. The Foster SL4604 is a Brass 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: SL4604
- Interchange: 3/8" Industrial
- Body: 3/8" Coupler
- Thread: 1/4" Hose ID
- Valve Type: One-Way Shut-Off
- Material: Brass
- Operation: Automatic, push-to-connect (insert the plug; no sleeve retraction to connect)
- 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 coupler
- Automatic push-to-connect — which means you connect with a single-handed push, no sleeve retraction; faster cycle times on the line.
- Sleeve Lock (SL) — which means the sleeve locks after connection to guard against accidental disconnect and hose-whip.
- Brass construction — which means corrosion resistance and smooth, reliable operation.
- 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 Buna-N (Nitrile) seal.
Is this push-to-connect?
Yes — this is an automatic socket: insert the plug and it connects with no sleeve retraction. It also has Sleeve Lock to resist accidental disconnect.
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.