Boldox Drain Gun AC Condensate Line Cleaner with 4 Threaded CO2 Cartridges - Clears Buildup & Debris in AC Drain TubesSAVE MONEY Prevent water damage and avoid expensive HVAC service calls when you can easily unclog blockages in your AC condensate lines with this lightweight tool known also as a Gallo Gun. Made from high quality materials for durability and long lasting performance! EASY TO USE Simply unscrew the bottom, insert one Threaded CO2 cartridge and tighten snug (NOTE: If no air expels, tighten a full rotation more and try again). Pull the trigger to create