Features: OOTDTY fresh and great Material: Nitrile rubber,Features: reliable sealing and aging resistance. Pressure diaphragm of 45mm/50mm gasoline water heater. A nice helper for upkeep of water heaters, gas valves, Mainly used to extend water pressure. When the water film ruptures, it's going to leak. When the water number is large, the water stress on the water film will decrease, and there may be nearly no water leakage. When the amount of water is small, the water strain at the water movie will increase, but the leakage fee 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 guide measurement, just you should definitely do not mind before you order. 2 to the difference between assorted monitors, the picture will not mirror the particular color of the item.