[C38] Thru-hull fittings

[Don Strong]

Jon: Why not drill out to one of the the larger sizes and replace with 
Marelon throughhulls and seacocks or what ever the best of the best 
material is nowadays?
Don

On 5/8/13 5:40 AM, Jon Whitney 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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-- 
Donald R. Strong
Professor,
Department of Evolution and Ecology
and
The Bodega Marine Laboratory,
University of California, Davis,
Davis CA
95616
530 752 7886

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