The Auburn E5-WCC-1138L Liqlevelprobe is a cutting-edge 3/8 Inch Npt liquid level sensor designed to improve monitoring efficacy in HVAC systems. This state-of-the-art probe uses cutting-edge technology to accurately determine liquid levels within the apparatus. It fits into a variety of HVAC layouts and is easily installed using a standard 3/8-inch NPT fitting. https://www.partshnc.com/e5-wcc-1138l-auburn-liqlevelprobe-38-npt