[C38] Thru-hull fittings

[Steve Smolinske]

Jon,

 

Last year I had the macerator, head sink, knot meter and the forward
water intake glassed over, then put the knot meter on center line,
relocated the water intake and combined the macerator, head discharge
and head sink into one through hull, we went from having 6 through hulls
down to four.  The head/macerator/head sink and the water maker were
replaced with flospar's flotech flush closing valves.   They are pretty
slick when closed a plug extends to be flush with the hull.  I put in a
bilge sump tank that the head sink and shower sump drain into and then
it pumps to the head discharge.  
http://www.forespar.com/products/boat-marine-plumbing-flotech-performanc
e-valve.shtml  

 

Steve

#312 Peregrine

Seattle

 

 

From: listserve-bounces at catalina38.org
[mailto:listserve-bounces at catalina38.org] On Behalf Of Jon Whitney
Sent: Wednesday, May 08, 2013 5:40 AM
To: listserve at catalina38.org
Subject: [C38] Thru-hull fittings

 

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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