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Go Back   SailNet Community > On Board > Gear & Maintenance > 3/8 npt to 5/8 barb
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Thread: 3/8 npt to 5/8 barb Reply to Thread

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Topic Review (Newest First)
05-03-2013 05:35 PM
Re: 3/8 npt to 5/8 barb

3/8 NPT is 0.675 inch OD. That's just a little larger than 5/8". If I could find a bronze 3/8 NPT nipple, I'd just slide the hose on and double clamp it.
05-03-2013 04:40 PM
Brent Swain
Re: 3/8 npt to 5/8 barb

I have been using type 316 stainless for 40 years, with no problem.
05-03-2013 04:37 PM
Re: 3/8 npt to 5/8 barb

I thought one should not use brass with salt water. Use bronze with salt water or plastic.
05-03-2013 03:57 PM
Brent Swain
Re: 3/8 npt to 5/8 barb

Looks like the OD of your 3/8th pipe thread is the same OD as your 5/8th barb. So a 3/8th pipe nipple with grooves ground in one end should do the trick.
05-03-2013 02:28 PM
Re: 3/8 npt to 5/8 barb

Ours was for a bilge pump
05-03-2013 02:25 PM
Re: 3/8 npt to 5/8 barb

yeah, hamilton is one of the first sites i checked. but being that i need these for the raw water pump, i'm avoiding brass.
05-03-2013 01:01 PM
Re: 3/8 npt to 5/8 barb

Just went thru that same thing and finally found the part at Hamilton marine ,ordered it online had it in a few days. They had all sorts of brass adapters
05-03-2013 12:50 PM
Re: 3/8 npt to 5/8 barb

it's on a jabsco 2620 series pump with a bronze body.
05-03-2013 12:16 PM
Re: 3/8 npt to 5/8 barb

Is this on and A4 water pump ?
05-03-2013 11:36 AM
Re: 3/8 npt to 5/8 barb

You are going to want to match the material of the hose barb adapter to whatever the 3/8 npt is mating to. 3/8 is not a typical thread size for bronze hardware so that's why it's hard to find. If it's brass then you can use brass for the application and brass barbs of that size are sold here:

Otherwise, you might try Grainger Industrial Supply - MRO Supplies, MRO Equipment, Tools & Solutions They have a good selection of all sorts of fittings.
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