You may run into a thread incompatibility, depending on what you’re using to replace the old valves. Through-hulls and real seacocks use NPS threading (straight), while ball valves are generally going to have NPT (tapered) threads. You can’t safely mix the two. So if you’re attaching a valve directly to an existing through-hull you’ll need to check the threads on both to see what you’ve got. You’d be better off installing true seacocks if there’s enough thread to put in a decent backing plate.
There’s a good explanation here: http://www.pbase.com/mainecruising/replacing_thruhulls Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Apr 22, 2014, at 3:56 PM, Joseph Bognar <jbog...@sympatico.ca> wrote: > I am finally tackling a long overdue job. I am removing the > original 1979 Gate valves from my boat and replacing them with ball valves. > These are the ones connected to my cockpit drains . I am looking for and > suggestions or ideas from others that have done this already. I am trying to > save the through hull in this process also.Thanks in advance for any and all > advice > > Joe Bognar > 1979 C&C 30 > In Luff Again II > Grimsby,On
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