What do you think about cutting a hole in the tops of your fresh water tanks and installing water tight inspection plates so you can have access to the inside of the tanks for cleaning?
I have an '83 Niagara 31 which came from the factory with watertight inspection ports in her holding tanks. It makes it easy to flush them with a hose when sanitizing them with a bit of bleach. And being able to look inside to make sure nothing is growing down there is comforting as well. We're in the north so the boat is hauled out for the winter .. makes it easier to winterize the system with access from the cabin.
We removed the cover from the water tank in our 1987 Hunter 31 to thoroughly clean the tank. While we had it off I cut two inspection ports in it. They are great for all the purposes mentioned previously.
I cut three openings and installed inspection ports on an 82 Hunter 30. You won't believe the gunk and mold that is in there. Bleach water and a lot of scrubbing took care of it. Before I cut the holes, I drilled a small pilot hole and fed a wire to feel around and find out where the baffels are. There are two baffels to make three sections on the H 30. Then, I centered each port. Works fine.
My experience in owning 2 examples of classic plastic (a 1984 Catalina 25 and a 1987 Cal 28) is that the guys at the factory introduce dirt everywhere as they put the interior together. Your original water tanks and lines have probably had goddawful muck inside them all this time you will want to get at to clean out. The cleanout port should have been on the tank from the beginning, so adding one would be the right way to go.
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