Features: OOTDTY fresh and superb Material: Nitrile rubber,Features: dependable sealing and growing older resistance. Pressure diaphragm of 45mm/50mm gas water heater. A good helper for upkeep of water heaters, fuel valves, Mainly used to increase water pressure. When the water film ruptures, it's going to leak. When the water volume is large, the water stress at the water film will decrease, and there is virtually no water leakage. When the quantity of water is small, the water pressure at the water movie will increase, but the leakage rate would be faster. ThePackage Includes: 10 items of 45mm/50mm size. Specifications: Material: Plastic Weight: 25g/35g Size: 45mm/50mm Color: Black Package Includes: 1x Pressure Diaphragm Note: 1 allow 1-2cm mistakes due to guide measurement, simply be sure you don't mind earlier than you order. 2 to the difference between assorted monitors, the picture won't replicate the actual coloration of the item.