Stainless Steel Bellows Sealed Valve, Gasketed, PCTFE Stem Tip, 1/4 in. Tube, "NC-11 Cleaned" Nupro/Swagelok Valve   SS-4BK-TH3 Manually operated valve. In original special Cleaned packaging "NC-11".  Swagelok refers to this today as SC-11.