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More importantly, how do you get the valve closed if you have to?
Anyway, I had a similar situation. I bought a toilet bowl plunger (don't laugh) and took the handle off and threw it away. Get the old red rubber type, not a fancy new shape. Then I dove under and stuck the head of the plunger on the outside of the hull over the inlet for the through hull. Then, with soft wood plugs at the ready, I carefully unscrewed the seacock from the through hull. Be careful to NOT spin the through hull in it's seat in the hull, or I think it will leak. Put on a new seacock using teflon tape and/or pipe dope, replace the hose and you're back in business. Oh, and don't forget to pull the plumber's friend off the hull.
Hmmm, it occurs to me that you could save that handle for the plunger, cut it short, drill a hole through it and put a loop of strong twine or other small line through it, and then you could pull it off from topside and save yourself the second dive into that oh-so-clean harbor water!
1983 Ericson 33
Channel Islands, California