Material:Water-stop diaphragm is made of rubber material,it ensures durability and long-last performance Product Dimensions:The size of rubber diaphragm is 2.8cmx2.3cm,designed to fit greatly with your water tank Easy to Install:These rubber seals water stop diaphragms are easy to install in your water tank system,ensuring a secure fit and prevent leaks effectively Package Includes:Each package contains 5 pieces of the water inlet valve water stop leather rings,providing you with ample supply for replacement needs Compatibility:This rubber diaphragm is an ideal replacement part for your water tank