any sampling tube exceeding 3 feet in length requires mechanical support at the end opposite the detector to prevent vibration or sagging within the ductwork

this component is essential for resolving rollout issues and HVAC safety switch failures that prevent the heating cycle from initiating

this is a Valve Less Coil (VLC) model

this valve utilizes a specialized Tefzel characterizing disc to maintain a true equal percentage flow characteristic

preventing premature winding failure

Johnson Controls T-4506-2001 Pneumatic Cover Els PW 17895 any sampling tube exceeding 3Johnson Controls T 4506 2001 Pneumatic Cover and Faceplate, Horizontal, Brass, No Thermometer, 2 Setpoint Windows