Sarco Stopper has been established as quality manufacturers since 1877 and has a worldwide reputation for innovative line stopping & bypass solutions. Producing under pressure stopper bags for over 40 years, including the only Kitemark GIS/E4 Gas Bag in the world to suit Ferrous & PE Pipes, Sarco has also produced and pioneered the Hydro Stopper Bags to deploy with the award winning Aquastop and Hydrant Wizard isolation systems for water mains.