Stephen Trapani wrote:
Okay, time for me to pay the piper, face the music, um, take my lumps,
er, anyway...

Turns out, I don't have a magic head, don't even have a difficult head
problem due to some weird vent connection. What I have is:

Yeah the tank was full. Somehow my dreamworld must have gotten mixed up
with reality, or my memory mixed up with itself, or something, so your
first guess was the right one. Good job! Not only didn't I stump the
headmistress I didn't even give her a little challenge. Oh well.

So I have a through hull in the starboard locker near the head that
appears to be attached to the Y-valve and a through hull way over under
the port settee that, to the best of my knowledge is connected only to
the sink discharge. Where should I connect the raw water intake for the
head and where should I connect the overboard side of the head discharge?

Welll... You can use the same 3/4" thru-hull for both the head sink
drain and the head intake, but you cannot use the same thru-hull for
both the head intake and discharge. Since you don't have a 1.5" head
discharge thru-hull/seacock, you'll have to install one...or maybe not,
unless you're in coastal waters that offer immediate access to open sea
at least 3 miles offshore from the nearest point on the whole US
coastline...'cuz it's illegal to flush a toilet directly overboard or
dump a tank in any US coastal waters inside the "3 mile limit" and in
all inland waters including the Great Lakes.

Getting you sorted out is gonna be more involved than is practical here.
So how 'bout emailing me?
--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://69.20.93.241/store/customer/p...40&cat=&page=1