Patent ID: 7120943

Claim:
A plunger for clearing a clogged drain, comprising: an upper chamber separated from a lower chamber by a burst disk, wherein each chamber is connected to the other and has an inner cavity for receiving a compressed gas, wherein the inner cavity of the upper chamber has a smaller inner diameter than the inner cavity of the lower chamber; a sealing mechanism adjacent an open end of the lower chamber for connecting the plunger to a drain opening; a nozzle connected to an open end of the upper chamber; a handle connected to and axially moveable with respect to the upper chamber; and a compressed gas canister connected for movement with the handle and having a puncture point spaced from and in substantially axial alignment with a pin on the nozzle; wherein the burst disk provides a temporary barrier between the upper and lower chambers and is adapted to burst when the pressure in the upper chamber reaches a predetermined level, to thereby send a sudden burst of gas and energy into the drain.