DH Series couplings are two-way, shut-off couplings for industrial marine and oil applications. They are available in 1/4- to 1-in sizes in steel, brass, and stainless steel. The couplings have a maximum working pressure of 3,700 psi for 1/4 in to 1/2 in and 2,500 psi for 3/4 in to 1 in. Buna-N seals are standard with Viton and EPDM options.

The couplings are intended to be interchangeable with most name brands and to meet requirements of ISO standard 7241 series B. The couplings have shut-off valves in both ends, which may help to prevent fluid loss when disconnected. After coupling halves are connected, the valves should stay fully open for maximum flow.