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post #1 of 12 Old 05-08-2013 Thread Starter
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Thru Hull

Is it ok to coat the threads of a thru hull to the valve with the grey plumbers putty
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post #2 of 12 Old 05-08-2013
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Re: Thru Hull

Kind of depends on what your trying ?

Putting a regular NPT valve on the NPS through hull ?

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Re: Thru Hull

The thru hull and valve have been in the boat since it was built in the 70's. It started leaking a small amount last year so before I launch the boat this summer, I removed the thru hull, cleaned it up and now I was going to use 4200 on the thru hull flange and plumbers putty on the threads for the actual valve.
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post #4 of 12 Old 05-08-2013
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Re: Thru Hull

Are you replacing the valve or reinstalling the old one?
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post #5 of 12 Old 05-08-2013
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Re: Thru Hull

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Originally Posted by weephee View Post
The thru hull and valve have been in the boat since it was built in the 70's. It started leaking a small amount last year so before I launch the boat this summer, I removed the thru hull, cleaned it up and now I was going to use 4200 on the thru hull flange and plumbers putty on the threads for the actual valve.

I replaced two thru-hulls on my boat this year that were original to to the boat. What a PITA (Different story), but I epoxied a pre-drilled backing plate to the hull and let cure overnight. Cleaned up any excess cured epoxy followed with an thorough acetone down on all mating surfaces.

Then I gooped up the thru-hull (threads too), buttered the inside of the thru hole, the back side of the seacock flange, and the back plate with 3M 4200. Then I assembled everything, snugged tight, and removed the excess 3M 4200.

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Re: Thru Hull

I'm putting the original back in and have cleaned it up.
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post #7 of 12 Old 05-08-2013
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Re: Thru Hull


Do not do that, replace it.

But I guess the cavalery will arrive shortly, so I'm gonna grab some pop-corn for this.
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post #8 of 12 Old 05-09-2013
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Re: Thru Hull

I wouldn't use plumbers putty, as others have suggested use 3M 4200 or sikaflex on the threads. Plumbers putty is more for sealing under faucets, shower valves etc.. and I have never used it on threads with any success, I have always used a teflon tape or thread sealer on the threads.

If your thru hull and seacock are the tapered cone type you may have to due a little more than clean it to stop it from leaking. As a thought you may want to check out the maintenance kit at sparten marine which can be viewed here www.spartenmarine.com

Or as Morild suggests replace it to insure things are working properly.
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post #9 of 12 Old 05-09-2013
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Re: Thru Hull

Pipe dope not plumbers putty. I like Hercules Real-Tuff or Megaloc but there are many good ones out there.

When you have a thread mis-match, as you do with a thru-hull and in-line ball valve, I would suggest using both pipe dope and teflon tape to ensure a good seal. NPS and NPT are not really intended to be threaded together and is technically against the ABYC standards....

This is the difference between NPS to NPT and NPT to NPT....


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Last edited by Maine Sail; 05-09-2013 at 10:07 AM.
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post #10 of 12 Old 05-09-2013
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Re: Thru Hull

I think it would be best to replace the valve at this point, not reuse the old one.
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