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Old 11-21-2012, 06:59 PM   #1
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Marelon seacocks

We need to replace some of the seacocks, and possibly thru-hulls, in our recently acquired Californian 38. Does anyone have experience with the Marelon products vs the traditional bonze?
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Old 11-21-2012, 07:41 PM   #2
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Marelon seacocks sometimes get hard to turn. If you install them, make sure that you work them back and forth every few months. Other than that potential problem, they are trouble free.

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Old 11-21-2012, 08:00 PM   #3
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agreed...people that are afraid of "plastic" seacocks probably have no experience with them...
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Old 11-21-2012, 09:38 PM   #4
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I've got two Marelon valves on my fore and aft toilet thru hull water intakes. They replaced the old bronze gate valves on my Californian. Like the other people said, they are good quality, but you have to work them every few months or they get darn near impossible to close or open. I have replaced my other gate valves with bronze stainless seacocks and they don't seem to have this problem. Big advantage is, you don't have to worry about electrolysis with Marelon. But if it's a valve not easy to or often accessed, then maybe bronze.

So choose your poison, easy to open or no electrolysis??

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Old 11-22-2012, 06:18 AM   #5
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Plastic is great for Steel boats , BUT all plastic continues to harden as it ages.

We think nothing of relaping a 50 year old bronze real sea cock, for another few decades of service.

I'm not sure an aged chunk of plastic could take being jumped on in place after 5 decades,

bronze doesn't mind a bit, IF properly installed (Bronze 3/8 bolts).

How long do you want to keep the boat?
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Old 11-24-2012, 08:42 PM   #6
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Thanks for the input, will keep it in mind as we inspect and make our decisions.
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Old 11-25-2012, 12:51 AM   #7
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I've had a Maralon valve snap (not a seacock) and based on that experience I would be inclined to stick with the traditional bronze tapered seacocks.

For above the waterline use I would not be too concerned about using a Maralon valve. But for below the waterline I would stick with bronze for the reason FF describes-- a proven track record of decades of trouble free service with no attention other than routine servicing and adjustment.
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Old 12-01-2012, 09:59 PM   #8
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When I replaced the 17 seacocks on our boat...all below the waterline.. I did consider Marelon units.....but...after really thinking about it..and considering the fact that the originals I took out of the boat were over 30 years old....
I decided to stick with bronze. I think that unless you are going to put in the recessed or "flush to the hull" through hulls....it is best to stick with bronze.

And in the long run....the price difference wasn't all that great...
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Old 12-01-2012, 11:00 PM   #9
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I find it interesting that I too dismissed Marelon and installed Bronze. A bit ironic as they are installed in my plastic boat.

Caveat emptor; make sure you get real bronze. There is a lot of crap out there.
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Old 12-02-2012, 06:48 AM   #10
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I wouldn't have a problem with Marelon Seacocks.
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Old 12-02-2012, 12:40 PM   #11
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Seacocks are supposed to be able to withsatand a 500lb. lateral force.
When inspecting seacocks I put my foot on it and slowly apply pressure.

I learned the hard way not to do that with Marelon valves under 1 1/2" I.D.
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Old 12-02-2012, 12:56 PM   #12
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JAT said:
"When I replaced the 17 seacocks on our boat...all below the waterline.. "

Art DeFever did it right, we have one BWL through hull on our vessel.

This excludes 2 heads and the macerator.
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Old 12-02-2012, 03:43 PM   #13
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Quote:
Originally Posted by boatpoker View Post
Seacocks are supposed to be able to withsatand a 500lb. lateral force.
When inspecting seacocks I put my foot on it and slowly apply pressure.

I learned the hard way not to do that with Marelon valves under 1 1/2" I.D.
You didn't break a marelon seacock by stepping on it. Maybe the tailpiece or maybe the handle...maybe a marelon valve off a thruhull...but not a properly installed marelon seacock.
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Old 12-02-2012, 03:55 PM   #14
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I have an old bronze seacock that's getting a bit hard to close. Does it just need maint or cleaning up or does it need replacement?
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Old 12-02-2012, 05:32 PM   #15
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Service and maintenance. Good quality bronze seacock should outlast you and the boat.
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Old 12-02-2012, 07:56 PM   #16
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What exactly does service and maintenance on a brass seacok entail? I have only ever slapped some grease on them and opened and closed them every couple of months, sometime they do need a tap from a hammer to get them moving.
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Old 12-05-2012, 12:36 AM   #17
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Unless there is something wrong with them, regular, fairly frequent operation will be enough.

To service as below though the boat must be out of the water.

Sometimes though the taper plug must be lapped using lapping compound [car valves], Clover compound or grinding paste usually available from Industrial supplies and good car parts places. The surfaces can get rough and then sticky from the roughness.

Smear a light coating of compound on and insert the plug into the body and work it back and forth. This will smooth the mating surfaces. Wipe the stuff off, don't leave any grit and using some solvent to soak the rags, and if most of the surfaces are bright that should do it.

Grease and Reassemble and adjust the nut so there is a bit of drag and the thing should be good to go for a long time.

I installed a grease nipple in one side and would periodically shoot in a BIT of grease per side to help keep the operation free and smooth, valve in the open position so the grease is forced between the plug cone and body, not just into the cavity .
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Old 12-05-2012, 08:06 AM   #18
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I installed a grease nipple in one side and would periodically shoot in a BIT of grease per side

The "best" grease fittings , that are OK in a bilge, come from the outboard dealers , not NAPA.

Both sides of the fitting could use some grease.

Folks that dont trust grease fittings can simply unscrew the 1/8 pipe winterizing plug , screw in the grease fitting , shoot and replug.

Doesn't take much longer , and is perhaps a bit safer.
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Old 12-05-2012, 12:09 PM   #19
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[QUOTE=JAT;116711]When I replaced the 17 seacocks on our boat...all below the waterline..

That's a lot of holes in the boat!

I'm counting in my head right now!
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Old 12-05-2012, 04:59 PM   #20
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Quote:
Originally Posted by psneeld View Post
You didn't break a marelon seacock by stepping on it. Maybe the tailpiece or maybe the handle...maybe a marelon valve off a thruhull...but not a properly installed marelon seacock.
I don't remember you being there
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