AVT is proud to carry more rugged, simpler to use and higher quality linestopping equipment than anyone else on the market! The AVt model 5120TL & 5120L rated at 100 Psi. (7 bar). In sizes 4"-20", higher pressure ratings and larger sizes are available! Brought to you by the people who invented linestopping for the water industry! AVT offers the most "advanced" linestopping equipment in the world, the tough user-friendly design makes using the AVT stopper as easy as 1,2,3! 1. Install our linestop fitting 2. Make the pressure tap 3. Install the Linestopping machine!