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 system for water mains.