Adapter, Complete, Thermocouple Gauge, Airfree, Stainless Steel Bushing, #15 O-Ring Jt. A 0-12mm Chem-Vac™ Chem-Cap valve having an o-ring joint for connection to the right hand side of AF-0300-03 vacuum manifold. Adapter is available for #15, #25, and #30 o-ring joints. Complete gauge consists of a glass portion, a Stainless Steel bushing drilled and tapped for 1/8 NPT permitting direct connection to gauge tube, and an open top GL-25 screw cap.