The Flow T1 adapter is a preventive solution to the clogged air conditioning drain line. The adapter is placed in the main drain line of any HVAC air-handler system to prevent the main drain line from becoming clogged. The user puts the pan tabs inside the Flow T1 adapter. The pan tabs dissolve all the slime and sludge buildup in the main drain line, preventing the problem of a drain line overflow and preventing damage to ceiling, wall, and floors. The adapter is an easy way to prevent main drain line overflow.