has also been strengthened. The service life is doubled and it is more wear-resistant than the previous product . When the backup valve cleaner is entangled by obstacles or edges, or even if the backup valve is still open and water is no longer spraying from the nozzle, you should consider checking or replacing - No assembly required. The relief valve is ready to install, just connect the fittings and hoses firmly to work. And opens every minute during to remove the cleaner by changing its cleaning direction. This valve is also capable of pulling the unit out of tight places if it gets stuck. Note: The data is all manual measurement, please allow 1 - 3cm error, in Due to the light and display difference, there will be a certain color difference, depending on the physical object received.