Ace Glass 8194-90 High Vacuum Easy‑Action Plug Bakeable Stopcock (0-3 mm Orifice)

Completely bakeable high vacuum stopcock. Plug has solid PTFE stem and glass filled PTFE threads and handle for dimensional stability and reduced expansion when heated. Barrel is borosilicate glass. An ultimate vacuum of 10^-7 can be realized with the standard O-Rings. An ultra high vacuum down to 10^-9 can be attained by baking out the system and O-Rings at 230°C for two hours or more. Smooth acting semi-needle valve permits the adjustment of opening. Reference marks on the body aid in repetitive setting. Supplied with FETFE O-Rings.