Ace Glass 8191-202 Vacuum Stopcock, PTFE, Needle Valve, Low Hold‑Up, 3 mm T‑Bore

Threaded vacuum stopcock with PTFE plug and new hooded handle that permits smooth needle valve adjustment down to 0.1 cc/min. flow rate. In-line design of barrel offers less hold-up than with 8192 design. Double PTFE ring seals prevent exposure of FETFE backup O-Ring to corrosive gases and liquids. Hooded handle can be removed from plug, making plug bakeable.