The 400A anti-siphon toilet fill valve and the 501 toilet flapper. This product is the perfect combination for 3.5 GPF toilets or larger. The fill valve features adjustable height from 9" to 14" and a code approved anti-siphon design, while the 2" Flapper features a solid frame for a secure seal with every flush. A universal fit toilet repair kit, designed for 2" flush valve toilets. Eliminate noisy and leaky toilets with one proven kit.