Ariosa, my comments.

Well since the old valve, thru-hull and water feed line were clogged I have decided to replace them all. The thru-hull and valve were ten years old so they had to go away this refit anyhow. I guess it’s time to go do a new design for the water supply and venting of the shaft seal. I could replace like for like but then I would have to install another thru-hull of future air conditioning or salt water galley water. I have decided to move up to a larger thru-hull and valve. I will then build a manifold capable of supporting 5 valves. Four of the ports will end up plugged, with one feeding shaft seal water. The four plugged ports will support a galley seawater foot pump, and up to 3 other seawater loads (twin air conditioners and a generator). What’s really great is I won’t have to put anymore holes in the boat