Stainless Steel Instrumentation Quick Connect Stem with Valve, 1.5 Cv, 1/2 in. Swagelok Tube Fitting. Swagelok tube fitting. Instrumentation quick connect for making and breaking tubing connections without twisting or wrenching; single-end, double-end shutoff and full-flow configurations per series. Maximum working pressure and temperature ratings are governed by the series, seat/seal material and end connections per Swagelok catalog MS-01-138; select and install against the applicable Swagelok data sheet.