Perfect Replacement : The Valve Replaces The Traditional Float Valve, No Electricity, Easy To Use, Long Life, Low Failure Rate, And Save Water Resources.Eco-Friendly And Durable : Composed Of Food-Grade Plastic For Drinking Water Pipes And 304 Stainless Steel Screws. Eco-Friendly And Durable To Prevent Rust.Automatic Control : The Upgraded Water Level Control Valve Has A Patented Design, Fully Automatic Control, And The Valve Does Not Need To Be Driven By Electricity.Benefit Of The Outside Water Level Control Valve Can Also Be Used For Internal Installation