Sometimes the through hull fitting has a straight thread ( NPS ), and the valve has a tapered thread ( NPT ). They are the same size and will thread together, but it really is not the best way to go. While not foolproof, if you can undo the valve and clean up the threads a quick test is to thread the valve back on. NPS to NPS should thread all they way down with a slight increase in pressure. A NPT valve to NPS through hull will thread easily, then at some point get tight and then go maybe one more turn. If you back it off you may see the end threads on the through hull are deformed.
Teflon tape or sealing compound will work, but the issue remains that you may have only 3 - 5 rows of thread holding everything together. If you have Marelon to Marelon here is a note: Marelon® valves elbows and tailpipes* have the parallel threads consistent with the thru-hulls. None of these thread forms are “self-sealing”; pipe dope, thread seal compounds or Teflon tape must be used on all Marelon plumbing fittings. Michael Brown Windburn C&C 30-1 Date: Mon, 13 Apr 2015 10:30:56 -0400 From: "Marek Dziedzic" <dziedzi...@hotmail.com> To: <cnc-list@cnc-list.com> Subject: Re: Stus-List sealing through-hull Message-ID: <blu184-ds2c2ac888e31d848d333ebce...@phx.gbl> Content-Type: text/plain; charset="utf-8" That part is solid. The seal is sound. But I had some leak between the thread of the through-hull and the thread (body) of the valve. This is what I need to seal. Marek
_______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
