Package Contents: You will receive 1pcs adjustable toilet dual flush valve set for most one-piece toilets. Please measure the size of the toilet yourself before purchasing! Button installation port diameter: 5.8-6.5cm, Water inlet valve interface: 1/2" threaded interface, Drain valve installation port diameter: 5.5-7.5cm, Suitable water tank height: 24-30cm Premium Materials: The toiilet flush system 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 The Dual Toilet Flush Valve features an external black sealing ring and a built-in silicone white sealing ring, providing double protection against leaks and ensuring watertightness. The product incorporates a built-in check valve that functions to prevent backflow of toilet water and thus avoid contamination of drinking water. Dual flush mode: This flush valve offers two modes: full flush and half flush. The half flush mode saves water and reduces unnecessary expenses, while the full flush mode ensures thorough cleaning. Choose either mode according to your needs. Easy installation: This replacement dual flush fill includes a flush valve, top button, mounting bolts, and toilet seal. Installation is quick and easy, requiring no tools. You can complete the installation in 10 minutes, saving time and effort while restoring your toilet's powerful flushing function., Manufacturer: LANZY