It's time for all you geniuses to think out of the box. It's time to figure out a better way of dealing with waste on a sailboat easily and responsibly. I am so disheartened to read these threads. So many things go wrong, so much time wasted working on a fix. There's got to be a simpler way to move waste from you to the holding tank.
I started sailing when I was 12 and at 30 bought a cruising boat - 33 Hunter. Used, clean, surveyed - only things that went wrong were weather related ie sudden squall ripping a jib to shreds. I just maintained that work horse of a production boat and I suppose luck played a part. Sailed her hard for 5 years, sold her to raise a family on land. Now I'm ready to buy again and I just don't want to deal with head and plumbing problems. I just dread it. I think I'd rather use a bucket with lehman's composting gel and dump it in the holding tank.