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  #1  
Old 03-13-2010
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Brass v plastic ball valve

We are looking to replace the ball valve for our raw water inlet. My inclination is to replace like with like, being a brass ball valve fitting. A friend, who is a sailmaker with over 60 years on the water, is advocating using a plastic ball valve, but I am not convinced. I have trawled the internet for comparisons to no avail. It should be noted that in Oz, we have no winter lay-up times not concern about freezing, so temperature is not an issue. Any thoughts would be appreciated, thanks.
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Old 03-13-2010
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Not plastic but Marelon like the one below? Marelon is best used with through hulls of the same material in my opinion as they have different expansion rates. If the through hull is bronze best to use a bronze body valve, with a chromed brass or bronze ball.
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Old 03-13-2010
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Hi Bosun,
I assume you are considering Bronze or Marelon, not brass or plastic.
The Marelon flanged valves from Forespar have worked fine for me. I had one for my raw water inlet until I replaced my engine last year and had to go up one size... I used bronze as for my new engine simply because it was available and inexpensive (I got it for a steal at Boater's World in the United States as they were going out of business last year).

Here is a lnk to an earlier discussion on this subject.
Marelon vs. Bronze

Others may have a strong opinion on bronze vs marelon. I don't. I would trend toward bronze but marelon is perfectly good in my view and it is used by many high quality boat builders.
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Old 03-13-2010
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True, but best not to mix materials - all bronze or all Marelon is best.
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Old 03-13-2010
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Marelon is an excellent choice, especially for those with metal boats... However, bronze seacocks properly maintained are probably more durable.
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Old 03-13-2010
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marelon works well - but you need to exercise them every so often so they dont freeze up on you. prob. true of bronze as well but i dont have those so i dont know
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