AQD500TF high temperature disconnects are two way shut off fittings. When disconnected, air flow is shut off in both the plug and socket allowing your vac valve to remain under vacuum pressure after being disconnected. Parts can be moved without losing vacuum. The socket or coupler is equipped with a threaded female fitting that creates an air tight seal when inserted into airflow. The plug portion has a female 1/4″ standard pipe thread. The sleeve portion of the coupler portion retracts upward, away from opening the receives the plug half. This sleeve is spring loaded so when released it returns to original position. Sleeve must be retracted before coupling is achieved and must return to original position to create an airtight seal between the two halves. Temps up to 500 degrees. Cad-plated steel.