So I will do it myself. If I could find the parts. The head sink drain is a 25 mm (ID) and the raw water intake is 20 mm. So I need:-- Tee with 25 mm fittings
-- Tee with 20 mm inline and 25 mm at 90 degrees/-- A foot or so of 25 mm hose
-- Valve with 25 mm fittings-- Bunch of hose clamps
When you installed this system on your previous boat, both you and Ralph apparently thought it necessary to run a second line off the head intake line to the sink drain line instead of just
re-routing the head intake line to tee into the sink drain line...
waaaaay over-complicating this job! I would never have advised you to do it that way.
You don't need all that stuff...the ONLY thing you need is the fitting to tee the head intake line into the sink drain line. Because it has to be metric to fit your plumbing, you may have to order it from a European source (try Canada first) It's just a relatively small PVC fitting, so you should be able to get it via airmail.
Instructions: Remove the head intake line from its thru-hull (close the seacock first!) and re-route it to tee into the sink drain line (you should be able to shorten it considerably). That tee needs to be below-waterline as close to the seacock as possible. This alllow you to flush with sea water as usual. To rinse all the sea water out of the entire system (anything poured into the bowl just goes out the toilet discharge line), close the sink drain thru-hull, fill the sink with clean water (never use gray water to flush toilets), flush the toilet. Because thru-hull is closed, the toilet will pull the water out of the sink, rinsing the sea water out of the intake line, toilet pump, channel in the rim of the bowl AND the toilet discharge line. If find yourself in waters that are skanky enough that you don't want to flush with raw water, simply close the sink drain thru-hull and flush using water from the sink.
And btw, Ralph...I didn't see an intake vented loop in any of your photos. It needs to be between the pump and the bowl--to replace the short piece of hose toilets mfrs use to connect 'em--and at least 6-8" above waterline AT MAX HEEL, not just when the boat is at rest, which on most sailboats put it 2-3 FEET above the bowl.
--Peggie