High Quality Materials: Each valve diaphragm washer is made of quality rubber and plastic, which is reliable, not easy to deform, tear and break, and long service life; The surfaces of these washers are smooth, don't worry about scratching your fingers. Easy to Use: Disconnect the water supply from the water tank and rinse the water tank, then unscrew the large plastic cover, remove the membrane seal from this cover and replace it with a new one; Then you will see a plastic vertical line on the back of the gasket and line it up with the lid gap; Tighten the cover, make sure the float on the arm is positioned horizontally, restore the water supply and install it. Size: Overall diameter: 27mm, inner diameter: 23mm, depth: 15mm, Side Entry Diaphragm Washers for Cisterns Replacement Rubber Diaphragm Washers. Universal Valve Diaphragm Washer: These side-entry diaphragm washers are suitable for most side-entry and bottom-entry valves, they can easily and effectively repair the water tank that can't work properly, saving your time and effort. Easy to store: These valve diaphragm washers are portable and lightweight so they can be carried easily, you can put them in your shelves, cabinets, handbags, backpacks, luggage and more, which are convenient and efficient for you to carry. /p>