The product principle These inflatable pipe stoppers consists of aluminum foil composite material, that means to use the theory of inflation for the sake of plugging the mouth of pipe. There are waterproof adhesive on both sides of the inflatable pipe stoppers.When waterproof adhesive to inflate air pressure weighs 2.6-2.8 kilogs,it will fill the space among pipeline, inflatable pipe stoppers and electrical conduit ,so that it can get totally ste