Abstract: A spring loaded, axially slidable, adjustable coupling adapted at one end to fit over a drive means shaft, such as a motor, and adapted at the other end to fit over a driven shaft, such as a pump shaft, wherein this end can receive shafts of varying diameters. The device comprises essentially a hollow cylinder adapted at one end to fit over a drive shaft, a coil spring disposed in the cylinder, a groove formed in the cylinder for nearly its entire length, a second groove formed in the cylinder for nearly its entire length and located 180.degree. from the first groove, a locking device which extends into the two (2) grooves for positioning and holding the spring, and a second cylinder slidably disposed in the first cylinder for compressing the spring. The end of the second cylinder distant from the spring is adapted to fit over driven shafts of various diameters.

Abstract: A device for unclogging blocked pipes, tubes, drains and other conduits employing a source of compressed gas such as a CO.sub.2 cartridge or air compressor and a secondary source of compressed gas and/or liquid. A compressed gas storage chamber receives and holds the compressed gas until a desired predetermined pressure is reached at which time a valve is opened allowing the gas under pressure to flow to the conduit to be unclogged. Simultaneously, and if required, a secondary source of compressed gas and/or liquid can be led into the conduit to be unclogged, downstream of the storage chamber release valve. An automatic safety gas relief valve is also disposed downstream of the storage chamber release valve for safety.