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Pipeline water blocking airbags and pipe plugs are particularly suitable for conducting closed water tests, closed air tests, leak point searches, temporary water blocking during pipeline maintenance and testing after sealing drainage pipelines. Pipeline water blocking airbag, pipeline blocking device, pipeline blocking device, composed of airbag, pressure gauge, tee, 6-meter-long specially made pneumatic hose, and air pump. In the closed water test of building floors, it can withstand the natural pressure of 2-6 floors of water.