The Auto-Lev is an accurate, easy to install device that will maintain exact water levels in fountains, ponds or water-holding tanks. The simple and easy-to-adjust float valve assembly is accurate and maintenance-free. Auto-Lev is constructed of durable high-impact plastic and includes a commercial grade float assembly. The plumbing port is a standard 1/2" female slip and the equalizer line is 1" female slip.