The device is only approved for the SONAX products included in the instructions for use. The device is not suitable for aqueous cleaners. To fill, unscrew the valve body from the container by turning it anti-clockwise. Fill container, see scale for maximum quantity. Screw the valve body back in and pressurise the device. Maximum pressure is reached when any excess pressure escapes via the safety valve. Spraying is activated by pressing the push button on the valve body. After use, depressurise the device by lifting the button on the pressure relief valve until the excess pressure has escaped from the container. Maintenance: lubricate moving parts regularly with a little oil.