Easy to install without tools: simply twist the button onto the toilet water tank by hand. Durable construction: made from ABS plastic and a 362 stainless steel spring for reliable performance. Dual flush control: two button design offers a choice between semispring and fullspring flush modes for versatile use. Wide compatibility: suitable for onepiece toilets, twopiece toilets, and squatting toilets, using a twobutton configuration. User friendly and maintenance friendly: intuitive operation and dependable function with straightforward assembly. Use scenarios: Home bathroom upgrades or renovations to add a dual flush option. Replacing a worn or malfunctioning toilet button in rental properties with a simple, tool solution. Retrofit or upgrading multiple toilets in guest houses or small facilities that include different toilet types (onepiece, twopiece, and squatting).