Steve Lusardi wrote:
Peggie,
The dilemma is the Lloyds certification for thru hull fittings, which call
for fire proof valves against your years of experience.

If you must use metal for your thru-hulls, use bronze. It's a lot more
resistant to urine than SS...almost bullet proof. In fact, the best
high-end manual marine toilets--Blake, W-C Skipper, Groco K etc--are
bronze "thrones."

--
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/boat_odors/