Reliable sealing and anti-aging. Good helper heater, fuel valve and assorted maintenance. Made of high-quality materials, it can be used for a long time. Replacing the old one is a reputable choice. Type: Gas water heater equipment Colour: black Material: rubber Size: 54mm diameter Package Contents: one hundred x strain diaphragm Only the above equipment content, varied products are usually not included. Note: Light and diverse displays can cause the colour of the object in the photograph just a little assorted from the real thing. The length allowed error is +/- 1-3cm.