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Features: OOTDTY brand new and effective Material: Nitrile rubber,Features: reliable sealing and ageing resistance. Pressure diaphragm of 45mm/50mm gas water heater. A good helper for maintenance of water heaters, fuel valves, etc. Mainly used to increase water pressure. When the water film ruptures, it is going to leak. When the water volume 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 movie will increase, however the leakage price could 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 errors because of instruction manual measurement, just be sure you do not mind earlier than you order. 2 to the difference between different monitors, the picture might not mirror the particular coloration of the item.