Swagelok 316-QC4-Key-3 Quick Connect Fitting

The Swagelok 316 QC4-Key-3 quick connect fitting combines 316 stainless steel construction with the QC4 quick-connect stem design to deliver fast, tool-free connections for instrumentation lines while minimizing air inclusion and potential spillage during repeat connect/disconnect cycles. The specific stem variant SS-QC4-S-400K3 is a 316 stainless steel Quick Connect Stem without Valve, 1/4 in. size, rated with a Cv of 0.3, and is identified by the Green Key (K3) code for keyed mating with the corresponding QC4 body. This stem is intended to be used with a matching QC4 body to form an assembled quick-connect pair; Swagelok notes that keyed quick-connects prevent intermixing of multiple lines, and any QC4 stem will fit any QC4 body of the same size, provided the correct key code is used.