[C320-list] head thru hull

[Bill Culbertson]

Two quick thoughts.
1) Generally elbows in head discharge lines are discouraged. They catch things, they disturb flow.  It might well be more effective to have the original extra five feet of hose if it avoids an elbow.
2) the arrangement you describe with the hose leaving the head and going into the wall sounds like the anti-siphon loop.  You DON'T want to eliminate that as you can sink your boat.

I've found it helpful to keep in mind that a) Catalina is not incompetent b) Catalina is careful about costs.  If Catalina spends extra money on something (like 5' more discharge hose or a hose loop into the medicine cabinet and back) it is almost certainly for a good reason.

 -bill


----- Original Message ----
From: Darrell <dgray at n-sea.org>
To: C320-List <c320-list at catalina320.com>
Sent: Monday, January 8, 2007 9:51:58 AM
Subject: [C320-list] head thru hull


I have a 1994 C320 hull # 88. For the past few years, my direct overboard 
thru hull valve for the head , has got harder and harder to turn to the 
point you are pretty sure you are going to break the handle off, I have 
tried lubing it on 2 occasions when I have had the boat out of the water 
with little result. This year I just plan to lift the boat and pressure wash 
it while it the slings, replace zincs and drop it right back in the water. I 
thought I would also replace this valve. Using a tape measure and a flash 
light, the outside diameter of the thru hull tread appears to be about 2 
inches. I am assuming the thru hull diameter is 1 1/2 : like the rest of the 
head plumbing. When I went to west marine to by a replacement valve they 
were also certain it was a 1/1/2 " thru hull so I bought a 1 1/2" marlon 
valve that has a female thread of just under 2 ". Because I only have a few 
hours in the sling, I would like to confirm with any other owners that may 
have replaced this valve that I  have the right part. Any help would be 
greatly appreciated. On another note, I am just replacing  all my head hoses 
and must say I am not to impressed with the original Catalina installation, 
with one elbow and a different y valve, I was able to eliminate about 5 feet 
of 1 1/2 hose. Also the vent hose fitting on the holding tank is 3/4, while 
the actual vent is 1/2 inch. I am also replacing the head as the pump has a 
small crack and is leaking. The new head has a hose going directly from the 
top of the pump to the back of the bowl. My original toilet has as hose 
leaving the top of the pump going through the wall behind the head and 
another one returning to the back of the bowl. At first I thought this was 
just a big loop, but while scratching my arms all up on the rough fiberglass 
behind the cabinet it appears this isn't the case. I am planning to remove 
the toilet paper holder so I might see what is going on back there better. 
Again if anyone who has encountered this could enlighten me as to what is 
going on back there , I would greatly appreciate it. Don't get me wrong, I 
love the boat , I am just tired of coming home itchy and smelling like crap, 
Darrell

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