Model Designation is Pipe Plug (PP). The main purpose of usage of PP model is blocking pipe or channels to stop fluid flow (water, sewage water or drain water). Pipe Plugs are used for pipeline leakage test, if there is an available manhole on the line, the pipeline to be blocked from both side by two pieces Pipe Plug model plug and then the test water to be filled from manhole to test the system. PP model pipe plug does not include bypass connection, but that includes inflation connection and holding hooks.