Features: OOTDTY brand new and positive Material: Nitrile rubber,Features: dependable sealing and growing old resistance. Pressure diaphragm of 45mm/50mm fuel water heater. A good helper for maintenance of water heaters, gas valves, Mainly used to extend water pressure. When the water movie ruptures, it will leak. When the water volume is large, the water strain on the water film will decrease, and there could also be almost no water leakage. When the quantity of water is small, the water stress on the water movie will increase, however the leakage price is probably 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 mistakes because of handbook measurement, just make sure you don't intellect before you order. 2 to the variation between diverse monitors, the image won't replicate the actual color of the item.