[C38] Thru-hull fittings

[Max soto]

Hi Jon,
I instalen new thruhulls and valves a copule of years ago.. Everything is now 3/4", except for the engine intake, which is now 1" because of a bigger engine that I was suppossed to install, but that's another story..  3/4" all around the boat is ok (except for the 1-1/2" head discharge, of course!). Those threaded nipples coming out of the hull are actually threaded into the fiberglass.. It took me around two hours to remove all of them. You will need to do some fiberglass work on the hull, since those nipples were not installed perpendicular to the hull, and the new thru hulls must be installed that way...   So first, remove the halves, get a pipe wrench, a couple of beers and good luck !   I was lucky that they weren't corroded, so i didn't break any of those. Then take a grinder and get rid of the fiberglass remains on the inside until you get to the hull.. Fill the places were you think voids might appear, get a hole saw and rectify the holes on a perpendicular angle to the hull, and you'll be ready for the new ones.
There are lot of steps involved, but is in fact pretty straight forward. 
Regards,

Max Soto A.
C38 #198 Estancia
+506-8312-1367
Alajuela, Costa Rica

On May 8, 2013, at 6:40 AM, Jon Whitney <jonwhit23 at aol.com> wrote:

> Hi All,
> 
> I'm preparing for my first haul-out since buying our 1979 C38 a couple years ago and am seeking some advice on re-doing our thru-hulls.  All 4 of the current thru-hulls (head intake, sewage out, galley sink out, and engine intake) are all configured with in-line ball valves threaded directly onto the thru-hull fittings (i.e., no seacocks) and mismatched thread sizes (NPS on thru-hull to NPT valves). All 4 are badly corroded (presumably due to non-marine rated valves). 
> 
> From what I can tell (measuring them in place) the thru-hulls sizes are as follows:
> Head intake (under vberth): 1/2" NPS
> Galley sink out (under galley sink): 1/2" NPS
> Engine intake: 1/2" NPS
> Head/sewage out: 1 1/4" NPS
> 
> Are these sizes consistent on other hulls? They don't all match what my blueprints say (e.g., galley sink out and sewage out are listed as 3/4" NPS) 
> 
> I am wondering what others have done when replacing their thru-hulls. I would like to install proper flanged seacocks for each one, but am having trouble finding flanged seacocks for 1/2" NPS thru-hulls (none of the manufacturers I have looked at carry them, e.g., Groco, Apollo, Buck Algonquin). I'm curious if others have run into this issue and what solutions you have found. If I can't find 1/2" seacocks, then have others resized the thru-hulls to 3/4" so I can fit them with the proper hardware? Should the engine intake be 3/4" anyway?  For obvious reasons I would like to avoid having to have to re-drill thru hulls to up the size, but am looking for best options.  
> 
> Any help or suggestions would be greatly appreciated. Thanks in advance for any advice.
> 
> Best,
> Jon Whitney
> "Eye Whitness"
> 1979, Hull 54
> Honolulu 
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