My problem with this I traced to me being the cause while hooking or disonnecting the water line in the UDC. My fix was about a 3 foot long piece of water hose that remains connected in the UDC at all times. When I need to hook up external water I remove the two round caps and drop the hose down through. After that I hook up the main hose to it. When disconnecting all the water drains out the short piece and I just pull it back up through the holes, bend it into a U shape, and it resides inside the UDC. Cheap, easy, and has been pretty much fool-proof so far.