Ken,

I shared this summary of my War on Thru-Hulls with the group 6 years ago.
Removing and sealing up half the thru-hulls was only half the battle. The
other half was re-plumbing to share the remaining fittings among a multitude
of users:

Silver Heels’ Thru-Hull Assignment List, 12/2007
================================================

Below-Waterline T-hull, Starboard Side #1

---

Intake to sea chest, which feeds the following:
– galley sink
– watermaker
– toilet
– anchor/foredeck wash-down
– bilge sump wash-down hose

Below-Waterline T-hull, Starboard Side #2

---

– engine raw water intake

Below-Waterline T-hull, Port Side #1

---

– galley sink drain

Below-Waterline T-hull, Port Side #2

---

– holding tank overboard pump discharge
– toilet discharge

Above-Waterline T-hull, Starboard Side #1

---

– midship side deck scupper
– electric bilge pump discharge
– shower sump discharge
– watermaker discharge
– head sink drain

Above-Waterline T-hull, Starboard Side #2

---

– aft side deck scupper
– starboard cockpit drain

Above-Waterline T-hull, Port Side #1

---

– midship side deck scupper

Above-Waterline T-hull, Port Side #2

---

– aft side deck scupper
– port cockpit drain

Above-Waterline T-hull, Transom #1

---

– manual bilge pump discharge

Above-Waterline T-hull, Transom #2

---

– engine exhaust

There is also a small hole in the transom, well above the waterline, for the
propane locker drain.

One issue I encountered on my boat was that many of the “above the
waterline” thru-hulls were, in fact, at or slightly below the present,
raised waterline. So where I needed to keep the fitting, I removed and
re-installed it a little higher up, sealing the original hole. I opted to
get rid of the forward cabin sink altogether, which used to drain through
its own below-waterline seacock. The depth sounder transducer did not need
to be thru-hull, and I scrapped the speed log wheel, which didn’t work
anyway, and sealed the hole.

Even with all this, I still have 10 holes in my hull, albeit only 4 of them
below the waterline. There is room for improvement, for further thru-hull
reductions, which I may get to in the future. For example, the manual bilge
pump could share some other thru-hull exit.

Tor

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Silverheels, P-424 #17
http://www.silverheels.us

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The one real bear is the one for the head. I plan to cut the head floor for
access.

Bob

I’m not being terse. This is from my mobile.
On Jul 21, 2013 5:45 PM, “Page Two” wrote:

Tor, I saw this list yesterday and had it mentally stored for future
reference when I get poking about in detail on the new boat. I know the PO
re-did a lot of the plumbing, I just haven’t had the opportunity to know in
detail and to what extent he tried to minimize the amount of thru-hulls.
I remember asking him as we were going through the boat, how many and it
was kind of a blank stare with a tilted head and he said, “a lot”. We have
the additional head forward also…for now! I’ll take it as it comes for
now.

As long as they can be gotten too reasonably well. Are there any of the
originals that are really way out of the way and hard to access?

---

Writing a New Chapter Page by Page in an Old Book.

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I don’t recall where my toilet discharge was originally, but it’s someplace
else now.

🙂

I don’t recall where my toilet discharge was originally, but it’s someplace
else now.

🙂

All the thru-hulls on my boat were and are accessible on the inside, albeit
some more conveniently than others.

Tor

Oh, no, nothing so simple. It’s directly under the center of the head’s
floor. Impossible to reach from the hatch over the v-drive or the forward
one. At least that’s where it is in my boat. Hull #8.

Bob

On Sun, Jul 21, 2013 at 6:23 PM, Page Two wrote:

Thanks Bob, I guess it’s under the sink and down low or maybe in the
locker stb of the fwd companionway?

@madsailor wrote:

The one real bear is the one for the head. I plan to
cut the head floor for
access.

Bob

---

Writing a New Chapter Page by Page in an Old Book.

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—
Bob Fine
s/v Pelican
Pearson 424 Hull #8
http://thesailinglife.blogspot.com
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