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 Stoppers 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 Plugs and then the test water to be filled from manhole to test the system. Also, these pipe bladder plugs used as pipe stopper which are blocking the line and sealing the pipe. It is kind of expandable rubber plug. Pneumatic plugs expand by air pressure and stop the flow to seal the pipe line.