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 stealing.If had inflation done and gas valve pulled out,the silica gel material installed on inflatable hole inside of inflatable pipe stoppers,it can depending on performance of self-padding allows tight shutoff immediately to prevent air leakage efficiently.