I just recently purchased a '86 H 25.5. When I opened the bilge access I found a white ribbed hose in the bilge, and I am wondering if this is for a pump, which I would like to install, or maybe a drain for the galley sink. The sink has a petcock with a shut off on it, but I don't know where this leads either. The head sink goes directly to a thru hull. Are there any piping diagrams available for this boat? This all looks to be factory installed. I guess I can fill the sink, open the drain, and see where it goes. Any suggestions would be greatly appreciated.