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Old 22-04-2013, 11:13   #1
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Through Hull Warning!

I just had my 2002 Lagoon 380 toilet through hulls removed and they were in the corrosion danger zone!! Very corroded and not safe.

I blogged several sites and the predominant advise I got was to leave them alone. Glad I didn't. If your boat is comparable to mine (age, time in the water, etc.), you're on borrowed time!!

Here's the replacement plan I'm leaning towards:

Seacock Backing Plates / Alternate Method / No Through Bolts Photo Gallery by Compass Marine at pbase.com

I'm looking for the pros and cons of Marelon polymer composite versus Groco Bronze hardware for replacement. Here's a few:

1) The breaking strength of Bronze is over double that of Marelon.
2) Marelon doesn't corrode.

Thoughts??

Tim
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Old 22-04-2013, 11:31   #2
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Re: Through Hull Warning!!

I don't own a Lagoon but if I did I would be doing and up grade. Here's an extensive discussion on the subject.>>> Lagoons Have Cheap Brass Thruhulls
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Old 22-04-2013, 11:38   #3
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Re: Through Hull Warning!!

Where the bronze thruhulls grounded to sacrificial zincs?
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Old 22-04-2013, 11:51   #4
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Re: Through Hull Warning!!

This is a problem on many boats. The manufacturers have started substituting brass valves for the bronze valves.

Bronze lasts forever, brass between 5 and 10 years.

I've checked, mine are bronze
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Old 22-04-2013, 12:11   #5
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Re: Through Hull Warning!!

EU came out with standards for ocean going boats. In their great wisdom, decided through hulls only needed to last 5 years. That allowed brass thru hulls meet the standards. EU manufacturers of sailboats and probably boats of all kinds began using brass through hulls despite their patent unsuitability. They must be okay because they meet the certification requirements. Trying to save a few hundred dollars on vitally important fittings on a $400,000 boat makes me wonder where else they've cut corners, caveat emptor to the max. Thankyou EU bureaucrats, Lagoon and probably many others.
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Old 22-04-2013, 12:18   #6
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Re: Through Hull Warning!!

11 years with the original valves! what do you expect?? many are aware about the poor quality of original brass stuff installed in EU boats, is up to you to dont reach that point, i will say between 3 and 5 years is time to get a good inspection of every truhull and valve installed by the builder, in doubt? replace.. Bronze all the way mate, my favorite Groco , Apollo will be nice to...
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Old 22-04-2013, 12:44   #7
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Re: Through Hull Warning!!

My marelon valves are now 11 years old and I've had no problems wth them at all. You noted that the bronze valves had twice the breaking strength of Marelon which may be true when new, but what about after 5 years?
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Old 22-04-2013, 12:58   #8
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Re: Through Hull Warning!!

Not all EU manufacturers use cheap brass fittings, mine are all bronze.
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Old 22-04-2013, 13:27   #9
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Re: Through Hull Warning!!

Quote:
Originally Posted by Captain Bill View Post
My marelon valves are now 11 years old and I've had no problems wth them at all. You noted that the bronze valves had twice the breaking strength of Marelon which may be true when new, but what about after 5 years?
Captain Bill, GOOD POINT! That's an excellent thought.
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Old 22-04-2013, 13:45   #10
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Re: Through Hull Warning!!

Never an issue with Marelon thru-hulls on my 19 year old TPI built Lagoon 37.
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Old 22-04-2013, 13:47   #11
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Re: Through Hull Warning!!

Quote:
Originally Posted by Captain Bill View Post
My marelon valves are now 11 years old and I've had no problems wth them at all. You noted that the bronze valves had twice the breaking strength of Marelon which may be true when new, but what about after 5 years?
After 5 years? twice the strength?! You must have missed the YouTube videos of MainSail with his strength tests of thru-hulls and valves incl. Forespar Marelon.

Bronze stays good, it is brass that causes the problems described.

start here, find the rest there:
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Old 22-04-2013, 13:58   #12
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Re: Through Hull Warning!!

Is it that important to use through hulls?? Do you need the water pressure?
Can I just run a tube up from the side for water intake?
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Old 22-04-2013, 14:08   #13
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Re: Through Hull Warning!!

If the Lagoon fittings were crap or more specifically brass or low quality bronze and lasted 10+ years, then Groco quality bronze should go much further. There's something about the low strength Marelon that scares me. I think that I'm leaning towards bronze Groco, with the bolt down adapter plate.
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Old 22-04-2013, 14:53   #14
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Re: Through Hull Warning!!

I don't know if my logic is outdated, but I have been under the impression as far as impact resistance goes on the outside of the through hull fitting, bronze is much stronger. I wonder if the colder water areas of operation would render Marelon more brittle? I really don't know if Marelon is the miracle material that will replace bronze or not. On a refit I performed on a 20 year old vessel, the bronze through hulls were fractured around the section where the bell and the straight section came together. The through hulls were new in 1974, none of them failed, but I did replace all of them, with bronze again. The general consensus here is below the waterline stay with bronze.
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Old 22-04-2013, 15:07   #15
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Re: Through Hull Warning!!

Quote:
Originally Posted by timbenner View Post
If the Lagoon fittings were crap or more specifically brass or low quality bronze and lasted 10+ years, then Groco quality bronze should go much further. There's something about the low strength Marelon that scares me. I think that I'm leaning towards bronze Groco, with the bolt down adapter plate.

No brass valve survive for 10 years in salty enviroment, the OP say are 11 years old yes, but when is the last time he inspect the valves? 2009? a valve and truhull can be in horrendous conditions inside and close to fail and no one notice if not properly operated and inspected, i see hiden places in many boats with valves in SOS condition and owners wonder why there is a valve there??
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