Kitchen & Bar Sinks: Drains Disposal Flange Apply plumbers putty around the underside of the outer drain flange lip and place tin the drain hole in the dink. The metal Harrier will sit directly on the metal sink. See diagram. Wipe away excess plumbers putty around the rim of the drain, Basket Strainer 1. 2 4. Unscrew the locking nut and washer from the drain flange, Apply plumbers putty around the underside of the tauter drain flange lip and place it in the drain hole in the sink.