I used only the WC Head Mate for the first 22 years of cruising and living aboard. It rarely needed a part but when it did the cost was dirt cheap(as I am). And because I'm also lazy I never did any maintenance other than some vinegar flushes to clear the hose. I also always flushed the paper along with the waste. I never could understand the filthy habit of putting used toilet paper anywhere but in the toilet.

The Head Mate was a head of simplicity.