Swagelok SS-QC4-D-400K3 Quick Connect Stem With Valve

Swagelok SS-QC4-D-400K3 is a stainless steel instrumentation quick-connect stem with a valve, engineered to pair with Swagelok QC4 quick-connect bodies for reliable, leak-tight connections in sampling and test lines where fast, tool-free connections are required. Constructed from 316 stainless steel, it is sized for 1/4 in. tubing interfaces and carries a flow coefficient (Cv) of 0.2, indicating a balanced throughput suitable for instrument gas and liquid sampling; the “D” designation identifies a DESO-style stem with an integrated valve, while the “400K3” suffix encodes the green-key color coding used to distinguish this configuration. The DESO stem design enables quick connections to QC4 bodies with a built-in valve that can isolate the line for purges or maintenance, helping reduce exposure and streamline setup in laboratory or process environments.