End noisy and leaky toilets with the Fluidmaster 400CR Fill Valve & 2" Flapper. This universal fit toilet repair kit is designed for 2" flush valve toilets and includes the 400A anti-siphon fill valve and the 501 toilet flapper. The fill valve is adjustable from 9" to 14" and features a code approved anti-siphon design, while the 2" Flapper is built with a solid frame for a secure seal on every flush. Make sure your 3.5 GPF toilets or larger are running properly with this No.1 solution.