Features: OOTDTY brand new and great Material: Nitrile rubber,Features: dependable sealing and ageing resistance. Pressure diaphragm of 45mm/50mm gas water heater. A good helper for upkeep of water heaters, gas valves, Mainly used to increase water pressure. When the water movie ruptures, it'll leak. When the water number is large, the water strain at the water film will decrease, and there's nearly no water leakage. When the quantity of water is small, the water strain on the water film will increase, but the leakage fee might 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 enable 1-2cm errors because of guide measurement, make sure that you do not mind earlier than you order. 2 to the difference between different monitors, the image may not reflect the particular color of the item.