Features: 100% fresh and excessive qualityMaterial: Nitrile rubber, features: dependable sealing and getting old resistance diaphragm of 50mm gasoline water heater nice helper for upkeep of water heaters, gas valves, and many others used to increase water pressure. When the water movie ruptures, it is going to leak. When the water volume is large, the water stress on the water movie will decrease, and there's nearly no water leakage. When the quantity of water is small, the water pressure on the water film will increase, but the leakage rate is probably faster. Specification: Material: Plastic: 50mm: Black. Package Includes: 10x Pressure Diaphragm. Note: 1 enable 1-2cm mistakes thanks to guide measurement, just make sure you don't intellect before you order to the difference between varied monitors, the picture might not reflect the actual colour of the item.