Wide Compatibility:This dual flush valve kit is compatible with most 2-inch two-piece toilets. Before purchasing, please confirm your toilet's drain hole diameter is between 2.44 inches and2.83 inches , tank height is between 11.5 inches and 15 inches , and tank lid hole diameter is between 1.4 inches and 1.57 inches. Compatible with most brands Easy Installation:This flush valve kit includes a flush valve, top button, mounting bolts, and a toilet gasket. Installation is quick and simple – no tools required. You can complete the installation in under 10 minutes, saving time and effort while restoring your toilet’s powerful flush. (Please check your toilet tank dimensions for compatibility before purchasing) Dual Flush Modes – Full & Half Flush:This flush valve offers two modes: Full Flush and Half Flush. The Half Flush mode saves water and reduces unnecessary costs, while the Full Flush mode ensures a thorough cleaning. Choose between the two modes based on your needs Premium Materials:The flush valve and button are made from high-quality ABS materials, ensuring durability and performance under varying water pressures and conditions. Additionally, the kit includes a thick rubber seal to significantly reduce the chances of leaks Adjustable Water Volume:The flush valve allows you to adjust the water volume for both Full Flush and Half Flush modes, helping you manage water resources more efficiently. Detailed adjustment instructions can be found in the product images