Features: OOTDTY fresh and effective Material: Nitrile rubber,Features: dependable sealing and getting older resistance. Pressure diaphragm of 45mm/50mm fuel water heater. A pleasant helper for upkeep of water heaters, gasoline valves, Mainly used to increase water pressure. When the water film ruptures, it's going to 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 quantity of water is small, the water pressure on the water movie will increase, however the leakage fee can 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 due to handbook measurement, make sure that you do not mind before you order. 2 to the adaptation between different monitors, the image won't mirror the actual colour of the item.