First time poster, long time reader. Finishing a wet/steam room with a free standing tub and have a drain connection question. The tub came with an offset drain that connects between the drain tail and a pvc waste. We're having trouble getting the supplied drain to seal up to the metal drain. We're too far along to redo the plumbing below the tile for a "free standing tub drain kit" so are looking for suggestions to overcome this hurdle. Thanks!