Top water inlet, Contains alloy rustproof filter Bottom water outlet, Three hole super sense , Automatic control, low self-complementary water, water full automatic stop According to the edge of the basin,Select the appropriate fixture Product diameter 4.5 cm,1.5 cm standard stop,Without electricity, easy to use, long life, low failure rate, saving water resources This product does not need power, mainly used for various systems water boilers, water towers, farms, automatic water supply system,high water tanks, pools, water towers of the industry and civil construction, etc. Specification: Interface G1 / 2. Working pressure 0.02-0.8MPa. The rate is 1-30L / min. Temperature -20-80 degrees Package Includes: 2 Pieces Water Level Control Valves