Zurn part# P6000-ECR-WS-RK is an AquaFlush chemical and clog-resistant rebuild kit for water closet flush valves (3.5 GPF). This kit contains valve repair kit, handle repair kit, vacuum breaker repair kit, and tailpiece o-ring. Constructed of chemical-resistant TPE material, Zurn Go Blue parts resist chemical infiltration known to cut short the life black diaphragms. This superior chemical resistance equates to 8 to 10 times longer life than traditional black rubber components, providing great performance and long lasting durability. Not only can this part be used in Zurn's AquaVantage and AquaFlush series, but Zurn Aqua parts are also interchangeable with Sloan Royal and Regal Flush Valves.