[Working Water Pressure]The float valve works with 0.2 to 10 bars water pressure,if water pressure is lower than 0.2 bars,the float valve not suitable for using, it not work. Working Temperature: 0℃~100℃ & 0-210°F [Easy to install water tank float valve]It's a mini float valve,plastic ball size is small,so easy to install. Built standard male thread, it perfectly to screw into standard female connector, the male thread is longer, that's for tightening the threads. The float valve comes with Tape and 1/2 inch elbow and 1/2 inch to 3/4 inch adapter. [No electricity request]A Float ball inside allows water to until a specific level is reached. Once the water reaches this level, the float valve be pushed up with water due to buoyancy and stop the of water. When the water level starts dropping, the valve open again, and the water to again,so no electricity [Automatic water shut off valve]This float valve is an automatic shut-off valve, when the water level reaches the control position, the float valve automatically stop the water supply, when the water level drops, the float valve automatically open the water, so it is a fully automatic water level controller [Application]The float valve maintains the level at set point without a noticeable variance in level. This float valve was used to maintain the level in an exterior fountain, on a yard fountain,for a rain gutter garden project,using it to make an automatic shut-off for swimming pools,for Fountain Reservoir,for automatic chicken water drinker,for cattle watering drought,for rain collection barrels in the outdoors etc., Weight: 0.44864070317 pounds, Manufacturer: Wesafrae