PVC Sealing Inflatable Test Air Bag 4" (100mm) Drain Pipe Bung Plug Plumbing

4" (100mm) PVC Drain Bag. Used when testing or during maintenance on drainage work. Easily inflates using standard air pump with fitted schrader valve (as vehicle tyres etc..). To create an air tight seal in pipes for a back pressure of 4"/100mm U Gauge