The Auto-Lev is an accurate, easy to install device that will maintain exact water levels on pools, spas, hot tubs, fountains, ponds or water-holding tanks. It's simple and easy-to-adjust float valve assembly is accurate and maintenance-free. Auto-Lev is constructed of durable high-impact plastic and sports a commercial grade, all-brass float assembly. The plumbing port is a standard 1/2" female slip. The equalizer lines are 1" or 1-1/2" female slip. The top access lid is available in tan, white or gray to best fit your application. It also has a new accessory extension collar (4058) that raises the ring and lid 1".