onnector allows for easy connection of a thermocouple gauge tube to glass vacuum system without the use of a glass to metal graded seal or Cajon fitting. Gauge connection consists of a GL 25 thread, a stainless steel bushing and an open top GL 25 screw cap. The thermocouple gauge tube is threaded into the #303 stainless steel bushing and inserted into the glass GL 25 thread.