Flexible Rubber Water Heater Diaphragms Washer Seal 2.2 Inch Dia 2 Pcs It usually takes around 1-4 Weeks Time to deliver after Item has been Dispatched. Please Check the Delivery Time Before Making Purchase(s). These electric water heater seal is made of rubber material, dual hole design, easy to install. Rubber Diaphragm can stand high temperature, a great help for appliances that use watersection system. Function as seal.