In a re-fit many years ago I looked for replacement thru-hulls.
After not having success finding a replacement I
got a NPT cutter head for a 'Rigid' pipe
threading machine, from the local rental shop.
You can adjust the "bite" of the cutter so I
started off loose and cut some taper threads by
hand. With the replacement ball valve nearby I
kept at it until there was the desired fit. After
the first one the rest were easy.
So, now my C&C original thru-hulls, which were in good shape, are taper thread.
Cheers, Russ
Sweet 35 mk-1
Vancouver Island
At 08:33 PM 26/02/2016, you wrote:
I think finding bronze NPS (straight) threaded
ball valves is a difficult task. For example,
every single valve sold by Defender is NPT (taper).
From: <mailto:cnc-list@cnc-list.com>Rick Brass via CnC-List
Sent: Friday, February 26, 2016 3:02 PM
To: <mailto:cnc-list@cnc-list.com>cnc-list@cnc-list.com
Cc: <mailto:rickbr...@earthlink.net>Rick Brass
Subject: Re: Stus-List replacing cockpit drain thru hulls 30 MK1
Joe;
The bad news is I donât believe that anyone
makes the flush thru hulls used on our classic
C&Cs anymore. All the ones I have seen are a
smaller OD than the recesses in our hulls.
The good news is that you rarely need to replace
a bronze thru hull. You just need one of the
thru hull step wrenches shown on page 118 of the
Buck Algonquin catalog and a strong helper to
hold the step wrench on the outside of the boat
while you remove the old valve from the threads
of the existing thru hull from inside the hull.
(you can also buy one at Lowes or Home Depot,
but it is called a plumberâs step wrench or something similar)
Both my boats came with brass gate valves on
most of the thru hulls, instead of proper
seacocks. When I got my 25, back in 1994, I
launched into replacing the gate valves,
starting with the cockpit scuppers. I screwed up
both the thru hulls because of my ignorance, and
had a heck of a time finding a flush thru hull
to replace the ones I had to cut out of the hull.
I finally found a pair of thru hulls at a
chandlery in NJ, across the river from Philly
a place sort of like an OLD hardware store with
lots of out of date hardware in stock. (Donât
you love poking around in those sort of places?)
And the guy at the chandlery explained how you
are supposed to get the old valve off the thru
hull without damaging the thru hull. Once I
bought the wrench, replacing all the valves was pretty straight forward.
BTW, the thru hulls should be bronze, not brass.
And the seacocks should be either bronze or
Marlon. You donât want to use brass if you are
in salt or brackish water. Thru hulls come with
straight threads. So do proper seacocks. Most of
my thru hulls were clamped to the wood backing
plates with a nut, so I did not have to use
seacocks with a flange on them. But I have
learned that ball valves intended for plumbing
come with tapered threads, so I had to make sure
I ordered ball valves with straight threads that
matched the threads on the thru hull.
Rick Brass
Imzadi C&C 38 mk 2
la Belle Aurore C&C 25 mk1
Washington, NC
From: CnC-List
[mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Joel Aronson via CnC-List
Sent: Friday, February 26, 2016 12:59 PM
To: cnc-list@cnc-list.com
Cc: Joel Aronson <joel.aron...@gmail.com>
Subject: Re: Stus-List replacing cockpit drain thru hulls 30 MK1
Try here:
<http://www.buckalgonquin.com/pdf/catalog.pdf>http://www.buckalgonquin.com/pdf/catalog.pdf
The company is near us.
Joel
On Fri, Feb 26, 2016 at 12:52 PM, Joe at
Zialater via CnC-List
<<mailto:cnc-list@cnc-list.com>cnc-list@cnc-list.com> wrote:
I am trying to find the mfg. for the cockpit drain brass thru hulls on my
1975 30 MK1.
They are flush to the bottom of the hull and have a flange diameter of 3.5
inches and a 1.25 inch hole. I have tried Groco and Perko but neither has
the correct size although they both have brass flush mount versions.
Does anyone have a suggestion on where I might find the original
replacement. I would hate to have to modify the hole or use epoxy to make a
non-original thru hull fit.
Thanks for any ideas on this.....
Joe
Zia - 1975 C&C 30 MK1
Annapolis
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Joel
301 541 8551
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