Elbow fittings at through holes - HELP!

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1 month 1 week ago #3646 by Cody Boswell
Hi,

Nice to be a part of this forum!
We just bought a Brewer 44 (1988) - and we have a small refit to do before we can launch and be insured.

Our boat came with PLASTIC ELBOW FITTINGS at all the through holes - and as our survey states, those should be changed out. Really thought it would be to just google and find bronze fittings, order and replace - but it seems to be IMPOSSIBLE TO FIND the right size?? Our through holes seems to be 1 1/2 inch thread - which I can find - I just have to change out all hoses to the same size, as noone seems to make the 1 1/2 inch thread pipe to 1" hose connection.
BUT - 2 of them seem to have 2 1/4 inch thread??? Do any of you have the same - and what kind of elbow fitting do you have? One of these through holes are in the aft head, basically just a drain to the cockpit.

Please advice!

//Cody & Therese
SV Vinyasa

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1 month 1 week ago #3647 by Franklin Gray
Depends on the type of plastic....Marlow fittings are actually better. The fittings don't have much pressure...a max of like 30 psi. You fresh water pipes have twice that psi. The real danger of thru hull fittings is corrosion. Now I will admit that bronze thru hull are good as they can handle the hull flexing better than plastic thru hulls, but the fittings attached to the seacocks don't take that beating. People tend to go lesser quality metals on those fittings so they are usually the first to corrode and break.

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1 month 1 week ago #3648 by Cody Boswell
Thank you - assumed so.
Though our survey says regulation is: "A seacock shall be securely mounted so that the assembly will withstand a 500 pound (227 Kg) static force applied for 30 seconds to the inboard end of its connection fitting, at any point in its most vulnerable direction" - and that "plastic below the waterline is not recommended", and I don't disagree at all, I'm sure the marlow fittings are great, but will we pass inpection for insurance using them? Maybe as long as everything is new and well thought out, the surveyor will give us a break? Such an annoying "issue"...

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1 month 1 week ago #3649 by Scott Lee
I have some interesting sizes on those drains also. It's worth considering - if the sizes you need (elbows, hoses, reducers, etc.) are hard to find in your home port, they will be even harder to find in remote cruising locations. It may be worth replacing the whole thru-hull with a more comon size. The scupper in the cockpit that feeds those thru-hulls isn't that big so you could have the added benefit of a smaller hole in your hull too. Of course that is more work and more cost so it's the hard choice.

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1 month 1 week ago #3650 by Cody Boswell
Actually - so now I feel a bit dumb, haha, but went to Lowe's to get some stuff and picked up a PVC 2" fitting for a couple of dollars, juuuuust to see how small it would be - and turns out: IT FITS! Sooo now I have to rethink my other 1-1/2' fittings and probably go down to 1-1/4 for those. If so, it saves me from having to change out any hoses. And I guess measuring a thread hole isn't as "easy" as it would seem! So that was a full couple of days of googling for nothing I guess...will keep posted to make sure they work. Thank you for your advice:D

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3 weeks 6 days ago #3651 by Bill Chamberlain
Plumbing fittings and hose are typically sized according to the inside diameter (ID) of pipe/hose that the water flows through. So the threaded diameter will be larger.

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