US Patent 7877821 Portable compressed-air gun for unclogging single drains

A hand-held gun-shaped device having an air compressor, an air chamber, and at least one detachable drain-sealing adapter, which are used together to clear soft stoppages from single drains. Air compressor power may be supplied by a removable power cord or battery. Optional features include a detachable side handle, a toilet plunger adapter, a hollow cup adapter for shower and kitchen sink drains, a funnel-shaped adapter for bathtub and sink drains, an air compressor tire valve, a tire valve attachment, a safety-release valve, and a pressure gauge. An operator sets the PSI setting dial or display on the air compressor above a needed threshold air chamber pressure and starts the air compressor. When the air compressor stops and an air chamber release button is activated, a drain-unclogging air burst is released from the air chamber. One charge of the air chamber provides one air burst.