Went for a Blake Lavac Zenith for the aft head - simple and mechanical
and only 10 euros at an NL boat jumble. Bought 2 new seals - cost more
than the Zenith. Intake water is sucked from a 6 litre domestic loo
cistern which is plumbed directly into FW supply - just like at home
(fresh water capacity is 6500 litres, so I guess a little more than the
average yacht). Outlet has Y valve to tank - 2800 litres!!! or
discharge overboard via syphon loop. Pics etc at
http://www.rmstone.screaming.net/int...internal1.html