The Tru-Test Apex Xtraflo 3/4" Trough Valve Long Tail is a full flow - diaphragm activated, armless, self-cleaning valve mechanism, with a longer valve end. It's design reduces stock damage and minimises blockage. It has an above water float adjustment, cord cleat for shutting off valve and a 1 1/2" water level differential from open to close. You can mount this valve on the bottom or on the side and has a bouyancy equal to a 6" round float. Minimum inlet pressure 5 PSI, Maximum inlet pressure 150 PSI.