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Presently I have a 1/2" thru-hull fitting that terminates in a 1/2" gate valve. This feeds raw water cooling to the inlet of the water pump.
I would like to change the gate valve to a new seacock (a ball valve with an integral flange that bolts to the hull for added strength and safety). However, I am having trouble finding a seacock in 1/2" size. Most (perhaps all?) start at 3/4". Groco is an example.
Does anyone know where I can find a seacock (with flange) in 1/2"? I do not want to use a standard ball valve. Apparently there is a safety issue mating the NPS threads of the thru-hull to the NPT threads used in most ball valves.
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I went through this all summer. Finally realized the best solution is a 3/4" seacock/throughull/tailpipe. Just use stepdown bushings to get to half inch hose after the inline strainer, if you use one.
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"New" 1974 C&C 27 Mk II undergoing refit
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1974 Mark II C&C 27
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3 years ago I replaced all of the seacocks on Carriden with Marelon ball units. When it came to the water intake for the engine, I deliberately upsized it to a three-quarter inch valve so that it would be ready in case I ever need to repower with diesel, all of which apparently need the larger opening. I then ran the three-quarter inch hose to a Marelon water strainer, which clears all of my intake water, and then ran a half-inch hose from the strainer to the water pump. This system has worked flawlessly for three seasons now.Marcus from Carriden
Mk III, Hull #847
Marcus Opitz,
Formerly from Carriden, Mk III, Hull #847,
now skippering "Everdina," a 1975 Ontario 32
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