The principle of the self-priming pump is to empty the air in the pump chamber and the water inlet pipe, and let the atmospheric stress carry up the water pressure Because one atmospheric strain is reminiscent of 10 meters, it is impossible to exceed 10 meters The suction fluctuate of all Self-priming pumps is set nine meters, and if it exceeds nine meters, it cannot be sucked up Please confirm the actual required suction vary earlier than buying