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Silly little plumbing question re Marelon fitting

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Silly little plumbing question re Marelon fitting

Old 08-03-2017, 04:28 PM
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Default Silly little plumbing question re Marelon fitting

I'm trying to order the parts to install a washdown pump.

Everything points to 3/4" hose.

But the only "plastic" fittings that I see for below water line are Marelon. So I need a 1/2" npt to 3/4 barb. No such thing that I can find. Only 1/2" to 5/8". Is that the same thing?

If not, where to find what I need?
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Old 08-03-2017, 06:18 PM
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I thought Marelon thru-hulls and seacocks were all NPS threading...I could easily be wrong, however.
But, don't mix thread types, ever, without proper adapter.
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Old 08-03-2017, 06:26 PM
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Hmmm... Thank you Karl.

Can someone point me to a fitting that is 1/2-14NPT to 3/4" barbed ?? Preferably some type of plastic/nylon etc?
(I want to attach it to 3/4" hose)

It'd be cool if West Marine, but I'd accept it from anywhere.

I'm trying to attach it to "D" on the following pdf drawing:

http://productimageserver.com/litera...al/31519OM.pdf
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Old 08-03-2017, 06:34 PM
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I don't think you're gonna find one from 1/2" npt to 3/4" barbed because it's not common or useful to go up to a larger hose ID. You'll need an adapter to reduce the 3/4" npt barb to a 1/2" npt..
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Old 08-04-2017, 05:59 AM
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Sounds like I need to get on the phone with someone at one of these stores that's knowledgable...

Anybody have a fav store like this?
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Old 08-04-2017, 06:22 AM
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You should be able to use this...http://www.forespar.com/product632.html
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Old 08-04-2017, 06:32 AM
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i just did a bronze set up , needed to go to a currently 5/8" hose. also no such thing.
I used a reducer bushing to go from 3/4 to 1/2 thread then a 1/2-5/8 barb
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Old 08-04-2017, 06:43 AM
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Thru-hull -> valve -> reducer coupling -> barb

As a second question, why not just put a larger thru-hull fitting in so you can go Thru-hull -> valve -> barb ?
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