Style:Glass 100% brand new and high quality    Can prevent the aquarium from the water flowing back, which is caused by the decrease of CO2 pressure,and keep the function and service life of CO2 bottle.    When used in the Ozone generator, it can prevent the Ozone from flowing back to the air pump and eroding the propeller.    It can protect the power head from the water flowing back which is caused by power cut.    Fits standard aquarium CO2 pipe(4mm) internal diameter.    Material: Stainless steel    Size(L*W):40mm x 4mm(approx)    Color: Silver    Quantity:1 pc(air pump is not included!)    Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.               Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package includes:    Stainless Steel check valve  x 1 Item specifics:Structure: ShutoffPressure: Medium PressurePower: SolenoidModel number: check valveStandard or nonstandard: StandardTemperature of media: Medium TemperatureMedia: WaterPort size: 3mmPower source: DCActuator mode: With Instruction
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