The GGC-12 SWOOSH® Drain Gun® CO2 cartridge in 12 piece pack. Clearing condensate drains with this CO2 cartridges deliver 800 PSI of oil free air. Cartridges are environmentally safe and recyclable. No need for air or nitrogen tanks. Reduces labor costs and time on service calls. Diversitech Drain Gun™ SWOOSH® Drain Gun Cartridge, Accessory Type: Accessory, For Use with: Drain Gun™ Swoosh Charles Gallo Drain Gun, Brown, Import