OK....here are pictures of my Rube Goldberg contraption....
Actually, I'm quite pleased with the final result. Total out of pocket cost less than $85! The most expensive items were the macerator pump ($46) and the contractor's hose ($26). Next task will be to test it out. My blackwater holding tank is currently empty, so the next time I bring the coach home (in 2 weeks for a President's Day weekend trip) I will fill the tank with fresh, clean water. If anything happens to go wrong I will not end up standing in 2" of liquified poo!
Below are the first 4 pictures showing the Jabsco self priming macerator pump completely assembled. The white fitting on top is a Thetford fitting that came with my coach. The rest of the parts were purchased at Home Depot and Lowe's. Total cost including the pump was under $85. I got the pump on Ebay for $46! The hose cost $26. I purchased a contractor grade 3/4" inside diamter hose.....the normal garden variety hose is only 5/8" inside diameter.
The rest of the pictures will appear in the subsequent post.