Ryan, I checked the diagram that Seth posted. It seems identical to the head on Mondial ... and had all the parts that I needed for the rebuild. As a mechanical engineer/tinkerer, one thing I found interesting is the way they got a single pump to do double duty. The pump is double acting -- the 1) upper side of the piston handles the inlet water, sucking it in and pushing it through to add rinse water around the toilet bowl, and 2) the lower side of the piston handles the waste from the bowl, pushing it through the outlet seacock.
Good luck ... rebuilding your head, it's not a job, it's a dooootie!...(sorry, couldn't help it)
