SweetPea gets a much needed upgrade for the waste disposal system.

I called West Marine and got a Jabsco Macerator Pump for $99.00.
Then I went to my local RV supply store and picked up:

1. 3 1/2" sweep tee 2. full flow 3 1/2" cut off valve and adapters 3. 3 1/2" X 1 1/2" holding tank reducer 4. 1 1/2" ell 5. 6" of 1 1/2" PVC pipe 6. 1 1/2" rubber 'clamp-on' connector 7. 20' X 1 1/4" PVC 8. 25' X 3/4" garden hose 9. handful of heavy duty nylon tie wraps

Here's a series of pictures that show how it's assembled.