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Old 02-05-2016, 11:08   #16
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Re: Seacock: Bronze or Marelon

You may also consider using a metal through hull and valve without bonding it to the grounding plate. Obviously there will be some normal stray current that will induce corrosion-but at a rate that will exceed the owners lifetime. I too have read and heard of several boats sinking due to the through hulls being blown out by lightning, and although there are no certainties with how lightning moves, not having your through hulls bonded goes a long way to solving this problem.


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Old 02-05-2016, 11:12   #17
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Re: Seacock: Bronze or Marelon

The other one they market to boat builders. I couldn't find it on their website but it has a round base and seems much better made. Even though Forespar doesn't try to sell this to end users, any Forespar dealer can order one for you.

Look for Series 93 in the OEM part of the Forespar website. They are there and they are excellent. Fat handle that doesn't break, too.
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Old 02-05-2016, 14:08   #18
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Re: Seacock: Bronze or Marelon

I am a little dubious about the premise of the OP that good bronze valves are not available in Greece. High quality plated bronze valves are manufactured in Italy and are widely available in the EU. I replaced all of my seacocks in Turkey with them 10 years ago, and my only complaint is that the handles are not stainless. Other than for metal hulls I feel more comfortable with bronze than plastic, even quality nylon reinforced plastic, for the long haul. Plastic does age...

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Old 02-05-2016, 15:00   #19
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Re: Seacock: Bronze or Marelon

Had bad corrosion on the ball (bronze with chrome plate) with bronze seacocks after only about 5 years in the water. Corrosion may have been partly due to stray currents in the water at the dock (Chesapeake area). Chrome plate was eaten off as seen in picture. Relative to the chrome plated balls, stainless balls are probably much better, but are also much more expensive (for no apparent reason). Have replaced the corroded thru-hulls with Marelon.
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Old 02-05-2016, 15:04   #20
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Re: Seacock: Bronze or Marelon

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Originally Posted by Brigadoon View Post
Had bad corrosion on the ball (bronze with chrome plate) with bronze seacocks after only about 5 years in the water. Corrosion may have been partly due to stray currents in the water at the dock (Chesapeake area). Chrome plate was eaten off as seen in picture. Relative to the chrome plated balls, stainless balls are probably much better, but are also much more expensive (for no apparent reason). Have replaced the corroded thru-hulls with Marelon.
Yeah, although Ball valve types have been accepted in recent years, they are not infallible and nothing near as good as tapered bronze proper seacocks. My guess is SS would corrode worse having wet trapped oxygen depleted areas. SS ball valves are made for industrial use. Not cheap.
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Old 02-05-2016, 21:02   #21
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Re: Seacock: Bronze or Marelon

There have been other discussions on CF about this issue. It is where I learned about these fittings:

Marine Products | TRUDESIGN

Available many places - maybe even in Greece

P.S. Kallitsis Hose | TRUDESIGN
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Old 02-05-2016, 22:05   #22
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Re: Seacock: Bronze or Marelon

The Trudesign that Crazy posted is an interesting system. Their valves have straight threads so they will engage with the thru-hull properly and their collar adds extra strength to the thru-hull. Be sure to buy one of their straight thread tailpieces to go with it. It's not good to screw tapered threads into straight threads, especially in plastic.

Raritan is the US distributor for Trudesign.
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Old 03-05-2016, 00:00   #23
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Re: Seacock: Bronze or Marelon

Be aware that the ones they sell as OEM have a proprietary thread pitch, not pipe thread compatible. Nothing will work except what they supply. Not sold in stores. Cross threading can be bad for your launch timing. Don't ask, but next time I am going to figure out how to hold the valve and thread in the thru-hull part both myself at the same time.
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Old 03-05-2016, 01:23   #24
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Re: Seacock: Bronze or Marelon

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Originally Posted by CarinaPDX View Post
I am a little dubious about the premise of the OP that good bronze valves are not available in Greece. High quality plated bronze valves are manufactured in Italy and are widely available in the EU. I replaced all of my seacocks in Turkey with them 10 years ago, and my only complaint is that the handles are not stainless. Other than for metal hulls I feel more comfortable with bronze than plastic, even quality nylon reinforced plastic, for the long haul. Plastic does age...

Greg
If you have any references then please let me have them. The problem here in Greece is twofold. Firstly vendors will try to sell you anything they have in stock whether it's right or not and will describe it any way they think you want to hear. Secondly all yellow metal is called bronze and most vendors don't know the difference between brass and bronze suitable for seawater use. If you reject what they offer they are not prepared to look further as they take your rejection as an insult.

It's very difficult trying to get good quality components here in Greece and the yard mechanic has never heard of bronze seacocks being available here.

I've ordered from the US for now but will need more next year so any info on local availability would be useful.

Mike
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