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This Airfree™ adapter has a 0-12 mm Chem-Cap® shut-off valve to protect your thermocouple gauge from damaging pressures or atmospheres. This adapter features an O-ring joint for connection to the vacuum manifold systems sold here. The gauge connection consists of a GL 25 thread, a AF-0303-10 stainless steel bushing and an open-top GL 25 screw cap. The thermocouple gauge tube (not included) is threaded into the #303 stainless steel bushing and inserted into the glass GL 25 thread.
The GL 25 connection will accept gauge tubes from 11 to 13 mm OD, and it seals by compression of the O-ring.