These Active Aqua float valves are made with NSF-approved PVCD and 18-8 stainless steel hardware. They are recommended for use with a hydraulic automatic shutoff valve or as a top-level control. Includes jam nut, sealing washer, JACO compression nut, and polyethylene float. Adjustable arm can be used vertically or horizontally. Santoprene® rubber seals are long-wearing, chemical-resistant, and replaceable.