Swagelok SS-4R3A — high-pressure proportional relief valve with a 316 stainless steel body and 1/4 in. Swagelok tube fitting end connections. Adjustable set pressure, spring-loaded. Part of the Swagelok instrumentation valve program for gas and liquid service on instrument, sample and small-bore tubing lines. Maximum working pressure and temperature ratings are governed by the valve series, seat/packing material and mounting per Swagelok catalog MS-01-141; select and install against the applicable Swagelok data sheet.