Universal 38mm Compatibility: These 38mm diameter flush buttons fit cisterns with a 4cm mounting hole and a 5cm lid. They are a reliable replacement solution for most standard toilets, reducing the risk of compatibility errors during purchase or installation. Independent Dual Control: Each button features a dual control mechanism, allowing you to choose between a low or high flush. This enables intelligent water management to meet the different daily water needs of homes, hotels, or commercial spaces. Easy, Tool-Free Installation: Installation requires no tools. Simply remove the old button, insert the new one into the existing hole, and tighten it by hand. This installation is quick and easy, even without DIY experience. Durable Chrome Finish: These buttons are made of sturdy plastic with a shiny chrome finish that resists moisture and corrosion. Their modern metallic look blends seamlessly into modern bathrooms while ensuring a long service life. Ideal Replacement Solution: These buttons fit most standard-opening European toilet models, making them ideal for home replacements, rentals, and public facilities. They're a reliable option for restoring water tank functionality without replacing the entire tank.