Foster K6S/SLV, 3/4" ISO-B Hydraulic Plug x 3/4" Female NPT, ISO-B Series, Less Valve, 303 Stainless Steel

Product Details

The most widely used industrial hydraulic quick coupling, compatible with ISO 7241-1 Series B. The Foster K6S/SLV is a 303 stainless 3/4" plug in the FHK Series, which interchanges with Breco DS and other ISO-B couplings on hydraulic tools, machinery, and equipment. Two-way shut-off, rated to 3500 PSI. Less-valve (straight-through) design for maximum flow. (Also known as the FHK Series.)

Why this plug

• ISO-B interchange — couples with any ISO 7241-1 Series B half of the same body size, the most common hydraulic standard.
• Less valve — straight-through bore for maximum flow where shut-off is handled elsewhere.
• 303 Stainless body — rated to 3500 PSI with a 4:1 safety factor per ANSI/B93.2.

Frequently asked questions

Are these ISO-B couplers?
Yes — the Foster FHK Series is compatible with ISO 7241-1, Series B, the most widely used industrial hydraulic interchange. It mates with Breco DS and other ISO-B halves of the same body size.

What coupler does it take?
Any 3/4 coupler on the same ISO-B interface in matching stainless, 303, less-valve. The matching Foster coupler is H6S/SLV.

Can I connect it under pressure?
No. ISO-B couplings connect and disconnect at zero pressure. Relieve system pressure first.

Why buy from hpcouplers: Foster quality, responsive US-based support, accurate specs, fast shipping.

ISO-B Series (ISO 7241-1 Series B / FHK) — Complete Series Chart

The size you are viewing is shown first, with the rest of the series below. Base couplings appear before ball lock and seal options. Dust caps and plugs fit by body size and are labeled by which half they protect. Click any part number to open that product.