Plastic or brass?

Sammy Hooker

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Sep 11, 2008
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Jim
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Been Layin' Sum Pipe
What do y'all think for your thru hulls and pickup....brass or Marelon plastic? The hull is fiberglass.

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G-Spot

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  • Mar 14, 2008
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    53’ Hatteras STEEL N TIME
    I brought this up a month or so ago with a few responses.... Bronze was the general consensus.... If you search it, you’ll find a decent article I posted from Kells Christian a marine surveyor who talks about the Marelon fittings and his experience as a surveyor....

    He was not against them....
     
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    G-Spot

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  • Mar 14, 2008
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    Grady White changed from plastic to stainless back in 97 or something. Should tell you all you need to know.
    My Grady’s had bronze below the waterline, stainless above... Even my old 1993....

    Although the fish drain boxes on one of them had plastic just above the waterline and it was actually broke when I bought it.... It looked yellowish from sun and age... impact against a dock appeared to be the culprit agains a brittle fitting.
     
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    Swede

    Yachtless
  • May 2, 2008
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    My Grady’s had bronze below the waterline, stainless above... Even my old 1993....

    Although the fish drain boxes on one of them had plastic just above the waterline and it was actually broke when I bought it.... It looked yellowish from sun and age... impact against a dock appeared to be the culprit agains a brittle fitting.
    Chrome over bronze to keep it Pimp
     
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    koopa

    Arima Adventures
    Feb 3, 2018
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    Like others have said bronze for seacocks and other underwater fittings, and stainless steel for scuppers/drains and other above water fittings. Plastic is prone to cracking but gets the job done until it doesn’t.
     
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    wdlfbio

    Once you go Cat, you never go back
    Sep 15, 2008
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    Pimp’n ain’t cheap. No plastic.
     
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    goatram

    Notable Member Gate Keeper to the Great Northwest
  • Apr 3, 2008
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    Pimp’n ain’t cheap. No plastic.
    Learn some before you speak you him. A grady is still a Clorox Bottle. You won't like what Brass/bronze does to Aluminum. Protect the plastic from Sunlight you'll be fine.
     
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    wdlfbio

    Once you go Cat, you never go back
    Sep 15, 2008
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    His isn’t an aluminum boat.
     
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    Elkfins

    Ungrateful Prick
    Aug 8, 2008
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    If you want to replace it in 20 or 30 years, go plastic, otherwise go with bronze or stainless.
     
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    ShadowX

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    Oct 10, 2010
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    I wouldn't just use any bronze seacock. You should get the Groco brand. They have a good reputation. Its a lifetime buy so might as well get the ones that people trust the most. There are different versions, but this is just an example. I personally prefer the full flange versions because its built like a tank. You can also buy backing blocks that fit these types of seacocks.

    And by the way, never use Home Depot brass fittings for marine fittings that may touch salt water. You want C83600 bronze that is designed for corrosion resistence. Its technically a bronze material, but it is also called "Leaded Red Brass, SAE 40" in other industries. In the marine industry, its more commonly referred to as the Naval Bronze.

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    ShadowX

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    Oct 10, 2010
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    Here is a link to good information about seacocks and the correct way to replace them. It also shows examples of people using wrong parts like yellow brass fittings.

     
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    mikepanz

    Newbie
    Apr 10, 2008
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    316 SS suffers crevice corrosion when submerged in sea water full time. DO NOT USE 316 SS for fittings that are submerged, bad things will happen.

    This is one of the reasons why Gemlux has come out with their titanium line of thu hulls.

    If you want to use SS it needs to be a duplex like 2205 or super duplex like 2507.

    Typically in a glass boat you will use Naval bronze....not the same as brass.

    In aluminum Marlon or one of the above better grades of SS or TI will work.
     

    Deviant

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    Apr 8, 2010
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    Bronze/brass....they can call the material what ever they want...its plastic.

    SS is top on my list

    Learn some before you speak you him. A grady is still a Clorox Bottle. You won't like what Brass/bronze does to Aluminum. Protect the plastic from Sunlight you'll be fine.
    If you have an aluminum hull....plastic - The galvanic corrosion will not do well and....well a bigger issue
    Fiberglass/"clorox" - Bronze for a moored boat or bronze or stainless for a trailered boat