I'm just looking for suggestions on how to tackle this easily. I'm a new homeowner and very new to handyman stuff still. The 1st floor's bathroom tub seems to be a copper drain leading into this black plastic piping, and water is clearly leaking from the seam as circled here. It collects onto sheetrock ceiling below, travels to the corner of the segment and then drops onto the floor through a part that has crumbled away. Its a finished basement bedroom. Is there a kind of sealing I could smother around this joint one handed? Its a pretty tight spot to reach and I can only get one arm in there.