Peggie Hall writes:

But if the
fittings were towards the centerline, why wouldn't the same occur when
the boat heels by exactly the same angle to starboard??

No, because stuff DOESN'T run UPhill...your head and vent fitting are
still on the port side...right? So when you're heeled to starboard,
it's an uphill run from the centerline to a head and vent thru-hull on
the port side of the boat.

Liquid in a tank is always gonna run toward the low side of the
boat...so it's always gonna run away from any fitting that's toward
the centerline on one tack... any hoses running across the tank from
the side toward the centerline are gonna be running uphill on the
other tack.


OK, maybe I understand it now. Do you propose to have the outlet
fitting towards the centerline and the hose then OVER the tank? I
guess that would work, then the 'stuff' would have to run uphill to
get out of the tank.

That would have been hard to achieve in my situation, the tank is
pretty much shoehorned in, to give max. volume. I guess I'll have to
pay attention to not overfilling the tank when on starboard tack...

I have a Lavac toilet (with which I am so far extremely happy). Does
this make me more or less vulnerable to this kind of problem?
Although the outlet valve of the Henderson pump seemed pretty sturdy,
it is my only line of defence, right? Once liquid gets through the
pump, it can flow right out of the toilet.

--Ernst