Scott Downey wrote:
How about solid copper pipe with short sections of that expensive hose just
to join to the thru hull and toilet itself etc....
Waste odors wont seep thru solid copper piping.
Shoot, you could even JB weld epoxy the pieces of copper together instead of
using metal solder.

Copper pipe is often used in boat fresh water systems, but urine is so
corrosive that copper isn't recommended for waste piping.

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