The AUTO-LEV™ is an accurate, easy to install device that will maintain exact water levels in pools, spas, hot tubs, fountains, ponds or water-holding tanks. Its simple and easy-to-adjust float valve assembly is accurate and maintenance-free. The AUTO-LEV™ is constructed of durable high-impact plastic and sports a commercial grade, plastic float assembly. The plumbing port is a standard 3/4" street L PVC. The equalizer lines are 1" or 1 - 1/2" female slip.