Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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Re: 1st big project, bronze thru-hull
Adding that the reason for the NPS thread is that it enables the installer to cut the through hull fitting to the correct length to accommodate the thickness of the hull and backing plate, while the NPT allows the seacock to be tightened down onto the flange.
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USCG Licensed OUPV Captain, ASA 101/103/104/105/106/118 Certified Instructor - Also certified in Recreational Marine Electrical Systems