Manifold drains connect all of the individual drains of a Modular/Ganged Heated Well so that all the pans can be emptied quickly and easily by opening a single 1" (25 mm) drain. For example, if you had a 5-pan well - all five (5) pans would be drained by opening the single manifold 1" (25 mm) drain that connects all five individual drains. All Ganged Heated Wells have this equipped so that this drain can be mounted right or left side.