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Features: OOTDTY brand new and wonderful Material: Nitrile rubber,Features: reliable sealing and getting old resistance. Pressure diaphragm of 45mm/50mm gasoline water heater. A nice helper for maintenance of water heaters, fuel valves, Mainly used to increase water pressure. When the water film ruptures, it'll leak. When the water number is large, the water pressure on the water movie will decrease, and there's practically no water leakage. When the amount of water is small, the water strain at the water film will increase, but the leakage fee can be faster. ThePackage Includes: 10 pieces 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 because of instruction manual measurement, just remember to do not intellect before you order. 2 to the adaptation between assorted monitors, the picture might not reflect the actual colour of the item.