Is there such a thing as a 3/4" NPT to 5/8" barb? - SailNet Community

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Old 07-11-2012
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Is there such a thing as a 3/4" NPT to 5/8" barb?

Mind the typo in the thread title .. mod please edit. Should read: 1/2" to 5/8"

My thru-hull is 1/2" and the groco strainer is 5/8". There was some heater hose on there before and that stuff is flexible so it all fit just fine ... I tried replacing that hose yesterday and learned of the difference. The hose I am replacing it with is the USCG certified stuff, 1/2" and it's STIFF .. so it won't go around the 5/8" hose fitting on the groco strainer. Both the 5/8" fitting and the 1/2" hose barb on the thru-hull are removable/changeable but I can't find any 1/2" to 5/8" or the other way around adapters. Does such a thing exist?
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edit: hmm .. is this what I'm looking for?

Last edited by smp; 07-11-2012 at 08:48 AM. Reason: not enough coffee
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Old 07-11-2012
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Re: Is there such a thing as a 3/4" NPT to 5/8" barb?

There's this. Conbraco Pipe To Hose Adapter

Does say both 1/2 and 5/8 hose so may still be a tight fit. Putting the hose end in very hot water before trying to slip it on will help.
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Old 07-11-2012
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Re: Is there such a thing as a 3/4" NPT to 5/8" barb?

Quote:
Originally Posted by smp View Post
Mind the typo in the thread title .. mod please edit. Should read: 1/2" to 5/8"

My thru-hull is 1/2" and the groco strainer is 5/8". There was some heater hose on there before and that stuff is flexible so it all fit just fine ... I tried replacing that hose yesterday and learned of the difference. The hose I am replacing it with is the USCG certified stuff, 1/2" and it's STIFF .. so it won't go around the 5/8" hose fitting on the groco strainer. Both the 5/8" fitting and the 1/2" hose barb on the thru-hull are removable/changeable but I can't find any 1/2" to 5/8" or the other way around adapters. Does such a thing exist?
Thanks

edit: hmm .. is this what I'm looking for?

If this is for an engine you may strongly want to consider up-sizing the thru-hull and seacock to at least 3/4". 1/2" is often far to restrictive for an engine intake, if this is what it is for. Those adapters are made but be sure you get bronze if this is below water.
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Re: Is there such a thing as a 3/4" NPT to 5/8" barb?

Quote:
Originally Posted by Maine Sail View Post
If this is for an engine you may strongly want to consider up-sizing the thru-hull and seacock to at least 3/4". 1/2" is often far to restrictive for an engine intake, if this is what it is for. Those adapters are made but be sure you get bronze if this is below water.
Hi, yes it's for an Atomic 4. The original thru-hull and lines are all 5/8" :/
I wrongly thought the thru-hull was 1/2" when I replaced it, pretty stupid. Everything is bronze and I plan to stick to that. Engine temp is fine .. not sure if there is a big difference in 1/2" vs 5/8" for water volume .. my thinking is that there are likely greater restrictions in the water jackets, pump etc than in the thru-hull itself.
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Re: Is there such a thing as a 3/4" NPT to 5/8" barb?

Wait a minute!
Really did not have enough coffee this morning .. the thru hull is 3/4"! Not 1/2". Jeez, my mind really only starts working properly after noon.
So if it's 3/4" and my hose is 3/4" and the hose is having a really hard time fitting onto the groco strainer .. what size is it? I am certain that it's not 1". Might be worth mentioning that I had to cut the old heater hose off of the strainer fitting. Didn't have any trouble getting it off the old thru-hull.

Last edited by smp; 07-11-2012 at 01:33 PM.
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Old 07-31-2012
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Re: Is there such a thing as a 3/4" NPT to 5/8" barb?

Did you find the answer, figure it out? If not, have you gone to Groco's web page:
GROCO MARINE PRODUCTS
If it's a 3/4" strainer, it'll have 750 in the model number, and the barb is for 3/4" ID hose.
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