The 507A 2” Flush Valve is designed to restore original factory performance to your toilet flush valve. Featuring easy installation and a universal fit for all 2” flush valve toilets. Constructed from corrosion-resistant materials, with built-in Microban technology (flapper) for a long lifespan. The Microban is built into the flapper itself to fight bacteria and flapper breakdown. The solid frame flapper design offers a secure seal and superior leak protection.