The Fluidmaster 703AP4 Toilet Fill Valve for Flapperless Toilets is a direct OEM replacement for flapperless, sometimes called dump bucket toilets. For use in Niagara Conservation Flapperless Toilets and more. Quickly restore performance back to factory direct standards. Built to last in any conditions from corrosion-resistant materials and featuring a 1 year warranty. With fast refill rates, this specialty fill valve design offers a simple and effective solution for old or faulty fill valves. The valve is easy to install in just a few minutes. This replacement valve is a code approved, anti-siphon design, that won't contaminate the fresh water supply and complies with UPC standards.