100Pcs 54Mm Gas Water Heater Pressure Diaphragm Fittings Water-Gas Linkage Valve Water Film Tympanic Membrane Reliable sealing and anti-aging. Good helper for water heater, gasoline valve and other maintenance. Made of positive materials, it may be used for a long time. Replacing the previous one is a good choice. Type: Gas water heater kit Colour: black Material: rubber Size: 54mm diameter Package Contents: one hundred x pressure diaphragm Only the above kit content, different products should not included. Note: Light shooting and diverse displays may cause the color of the item in the photo a bit varied from the genuine thing. The dimension allowed error is +/- 1-3cm.