A drain airbag pump is a device used to inflate drain air bags for testing or clearing blockages in plumbing systems. Typically consisting of a hand-operated or motorized pump, it is used to apply pressure to the airbag inserted into the drain. This allows the airbag to expand, creating a seal for pressure testing or dislodging debris. The pump provides a controlled flow of air, making it an essential tool for maintenance, construction, and drain inspection.