Fully certified 19L tank with liquid - filled gauge for increased accuracy and prolonged service life. Safety valve automatically activates when the air pressure reaches the maximum operating pressure. Pumps air into the tyre void forcing the bead to Seat against the rim of the wheel providing an easy way to Seat tubeless tyre beads. Suitable for use on cars, commercials, agricultural and ATV tyres. Fitted with a 1/4" BSP male coupler.