Features: OOTDTY fresh and large Material: Nitrile rubber,Features: reliable sealing and getting older resistance. Pressure diaphragm of 45mm/50mm gasoline water heater. A pleasant helper for maintenance of water heaters, gas valves, etc. Mainly used to extend water pressure. When the water film ruptures, it's going to leak. When the water quantity is large, the water strain at the water movie will decrease, and there may be practically no water leakage. When the amount of water is small, the water pressure on the water movie will increase, however the leakage charge would 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 thanks to handbook measurement, make sure that you don't mind before you order. 2 to the difference between diverse monitors, the image won't mirror the actual shade of the item.