Swagelok SS-4H — bellows-sealed valve with a 316 stainless steel body and 1/4 in. Swagelok tube fitting end connections. Welded bellows stem seal, SS stem tip. 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 documentation; select and install against the applicable Swagelok data sheet.