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Drain DawgTM regulator, blow gun, and accessory fitting kit. CB-2 DrainDawgTMInstructions The DrainDawgTM condensate drain line cleaning kit uses dry nitrogen or CO2 to clear drain line clogs. The DrainDawg may also be used for other uses including removing dirt from HVAC coils, purging of a system with dry nitrogen at low flow, inflating tires and more. Purging and pressure testing a system is only recommend with dry nitrogen. CO2 is not recommended. Make note of which type of gas is being used in that application.