The HFC4GA3-1B engine is used.
Water blocking is a water blocking airbag, which mainly has a protective effect.
Before using water blocking airbags on pipelines, the size of the pipeline should be clearly defined. Small ones cannot be used to fill larger ones, nor can large ones be used to fill small ones. The surface of the airbag should be cleaned to prevent stones and other sharp objects from affecting the normal use of the airbag. Before removing the airbag, make sure that no other person is working in the pipe. Check the traction rope, it should be taut and secured.