Abstract: A compressed air tool for unclogging drains includes an air chamber for storing compressed air. A one-way air inlet is fluidly coupled to the air chamber. An outlet valve selectively allows compressed air from the air chamber to enter a tube fluidly coupled to the air chamber. A free end of the tube may be positioned in the drain. A first check valve and a second check valve are each fluidly coupled to the air chamber and are each positionable in a retracted position or an extended position. Both of the first and second check valves are biased in the retracted position. The first check valve is urged into the extended position when compressed air positioned in the air chamber is equal to a first pressure. The second check valve is urged into the extended position when compressed air positioned in the air chamber is at least 10 psi greater than the first pressure.