The reason I pointed that out was not to say you personally would
forget to close a valve, but are you the only one that uses the boat?
Do you ever have it serviced by others? When I first started working in
a boatyard about 20 years ago, I was told to go down to a Catalina
(notorius toilet sinkers) they had just splashed, and "make sure all
the through hulls were open", so I did...One of the shipwrights had
left some sawdust in the galley, so I went up to grab a shop vac..I was
gone about 10-15 minutes, and when I returned....The floor boards were
floating in about 8 in. of seawater, which was flowing freely into the
boat from the bowl of the head . 15 more min. would have turned a
cleanup into a salvage. And the plane ref....I bet you don't
"preflight" your boat as meticulously as you do when you fly...and
people are not wandering around your plane with access to critical
system controls ...Bet your insurance co. may have an opinion as
well...I don't seem to have any odor problems with my siphon break,but
I'm careful to keep the lines well flushed...But if you really want to
keep the odor under control...in a word -Vacuflush.! I wish I could
afford that system...too steep for my budget, but one day...
markv