[Public-List] Seacocks and gate valves.

[Don Campbell]

John;
    In all likelihood the through hull on your boat for the intake to 
the motor and the small ones for the sink intakes are a homemade sort of 
system that involve a copper pipe flanged over a washer. These should be 
expendable and cut off if you cannot get them off any other way. I had 
the washer pop off when I tightened the lock collar and so there was 
nothing effectively keeping the through hull from popping into the 
hull.  from just  "sea" pressure. I did not need a 3/4 inch hole leaking 
the lake into the hull.
    You might want to also consider the condition of the plywood backing 
plates in the through hull set-up, especially if like mine they were not 
fastened to the hull. I think the original intent was that they would 
swell enough if there were any leaks to seal out any stray water. That 
worked, but once they have been wet and dry  as much as boats in Ontario 
have been, then the glue goes in the plywood and some rot can easily set 
in too ( not a cause and effect reaction between lack of glue and rot 
though).
    You will also find this to be a plumber's nightmare because of the 
pipe nipple fittings used originally and hose sizes compared to barb 
fittings and reasonable fittings to replace what is there that probably  
should not be there.
    I found that I had to cut off a couple of through hulls and that was 
easiest if I backed off the lock collar and cut the through hull off 
from the outside of the hull.
    With your background in design, you might want to consider the 
sizing of the scupper valves to one size larger than is there (it is 
more expensive and heavier too but the science of the drains works 
better if you use a 1 1/2" valve with two 1" feeders so you need a 1 x1x 
1 1/2 Tee to make this work, - also, not easy to find if you want bronze.
    I also found it disappointing to find that one cannot get a seacock 
now with just one metal in it; they all have  a SS ball valve in a 
plastic liner.
    If you want more of the story, e-mail me off line.
Don

John Flanders wrote:
>>
> I am finally getting around to replacing the original gate-valves on 
> my boat Sam. The 1 and 1/4 inch sink drain valve is frozen solid on 
> the through hull fitting. Has anyone any suggestions on how to get 
> this gate-valve off without doing too much damage. I have a similar 
> problem with the i/2 inch engine water intake, which I propose to 
> replace with a 3/4 seacock.
> John Flanders
> Sam 624
>
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