The Cleveland FK07176 Water Gauge Valve Set helps monitor water levels in commercial equipment by providing a clear view of the water inside the gauge glass. This valve set includes components designed for use with a 1/2-inch connection and 5/8-inch OD gauge glass tube. It works by allowing water to flow through the gauge assembly, displaying the internal water level for easy visual m... https://partsfe.com/water-gauge-valve-set12-x-58-od-glass-tub-for-cleveland-part-fk07176/1-FK07176.html