8189-04 High Vacuum Stopcock with PTFE Sealed O-Ring, 0-4mm Size - Ideal for Laboratory Glassware & Chemistry Experiments

High vacuum Stopcock with tef-cap O-Ring seals with variable openings from 0-3 to 0-10mm. Eliminate exposure to corrosive materials. For use to at least 13.6 kg internal pressure. An ultimate vacuum of 10-7 can be realized with the standard three seals. Smooth acting Valve permits fine adjustment of opening. Front ring seal makes a positive closure against a precision-formed heavy glass Seat. Not bake able. O-rings are not replaceable. Reference marks on body aid in repetitive setting. Replacement PTFE plugs with O-Rings available.

High vacuum

With tef-cap O-ring

0-4Mm size