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Features: OOTDTY fresh and beautiful Material: Nitrile rubber,Features: dependable sealing and aging resistance. Pressure diaphragm of 45mm/50mm gas water heater. A nice helper for maintenance of water heaters, gas valves, Mainly used to increase water pressure. When the water film ruptures, it'll leak. When the water quantity is large, the water strain on the water film will decrease, and there may be almost no water leakage. When the quantity of water is small, the water strain at the water film will increase, however the leakage fee can be faster. ThePackage Includes: 10 goods of 45mm/50mm size. Specifications: Material: Plastic Weight: 25g/35g Size: 45mm/50mm Color: Black Package Includes: 1x Pressure Diaphragm Note: 1 enable 1-2cm errors thanks to handbook measurement, simply make sure you don't intellect before you order. 2 to the variation between various monitors, the image will not mirror the actual colour of the item.