Patent ID: 7513274

Claim:
An inflatable test plug for insertion into a two way clean out, said two way clean out having a horizontal leg having an upstream side adapted to be connected to a building's sewer drain and a downstream side adapted to be connected to a sewer pipe, said two way clean out having a clean out entry port in its mid-portion that is attached to a vertical clean out leg, said horizontal leg having opposing inwardly extending projections located at its mid-portion, comprising: an inflatable hollow cylindrical body portion having a closed top, and an inflatable closed bottom portion communicating with the interior of said cylindrical body portion; said closed bottom portion having opposing locking indentations located in its outer surface, said opposing locking indentations adapted to receive said opposing inwardly extending projections located in said mid-portion of said horizontal leg of said two way clean out; valve means for introducing air under pressure into said test plug through said closed top of said cylindrical body portion and for releasing air from said test plug, said test plug adapted to receive and hold air under pressure during an inflation phase and to release said air under pressure during a deflation phase; said closed bottom portion adapted to expand prior to said cylindrical body portion during said inflation phase, said closed bottom portion adapted to deflate prior to said cylindrical body portion during the deflation phase; said closed bottom portion adapted to expand and block said upstream and downstream sides of said two way clean out when fully inflated by said air under pressure; said cylindrical body portion of said wall adapted to expand and block said vertical leg of said two way clean out when fully inflated by said air under pressure.