Maybe Clams was right after all!

This hose hasn't been taken off in at least 15 years, and is diesel-filler
hose (red, maybe rubber?). It's full of water because it's the hose going
from the suction-break (4ft above the hull) to the thru-hull (basically at
the hull), and either it or the thruhull is clogged (and the boat is in
the water and the thruhull is below the waterline, so how do you drain
it?)

So it's full of water. AND I'll never use this hose again, I just have to
get it off so I can clear the clog and replace the hose with proper sewage
hose. I don't care if I ruin the hose, as long as I can re-use the
fitting.

Aha! HOkay... In that case, yes...you can drill a hole in the hose to
drain the water out of it. Otoh, you could cut the hose behind the
fitting. The water drains out, and now you're only working with a 4-6"
length of hose instead of several feet. Assuming you can close the
seacock, take the fitting off the boat and put it on the bench to get
that few inches of hose off the fitting.

CAREFULLY, with a serrated knife or an electric cutting tool if you have
one, cut the hose lengthwise almost all the way through...be especially
careful when you're almost through it that you don't score the fitting.
Then just pry it apart. If you're 100% certain you can do it on both
sides without cutting into the fitting, do it...even cut it in 1/4s. If
it's really stuck on the fitting and doesn't want to pry off, use some
machine oil...or even WD-40. Let it sit for a while. You'll get it off
it you're patient...then clean up the fitting.

It's not a "blood, sweat and swear" job...it just takes patience and a
lot of care.

Peggie
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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://shop.sailboatowners.com/detai...=400&group=327

http://www.seaworthy.com/html/get_ri...oat_odors.html