Abstract: A plug to be temporarily located in a blocking manner within a pipe of a sewage pipe system of a building. The plug is to be installed within the pipe system as it is constructed. The plug is constructed to be frangible and totally dissolvable within water. A device is mounted on the sleeve directly in the area of the plug. When the plug is no longer needed, the device is operated from the exterior surface of the sleeve to effect breaking of the plug. The plug then passes through the pipe system and eventually dissolves.

Abstract: The method of making a sewer pipe testing apparatus which uses a frangible plug to be installed within the sewage pipe system. The plug is formed by tightly compacting between a pair of mold members a quantity of a powdered substance within a section of a cylinder. The resultingly formed plug is mounted within an annular groove within the cylinder. A movable member is mounted through the side wall of the cylinder and is capable of being moved in contact with the solid plug to cause such to break apart. The solid plug is to be coated on its exterior surfaces by a plastic material which retards dissolving of the plug by water, but which material is ultimately dissolvable within water.

Abstract: A plug to be temporarily located in a blocking manner within a pipe of a sewage pipe system of a building. The plug is to be installed within the pipe system as it is constructed. The plug is mounted within a flexible, enclosing wall, sleeve. The plug is constructed to be frangible and totally dissolvable within water. A clamping device is mounted exteriorly on the sleeve directly in the area of the plug. When the plug is no longer needed, the clamping device is operated to effect breaking of the plug and then disposing of the plug through the pipe system.