[1retired06]

For immediate fix, get a valterra flush king with external flush valve. Hooks right to your sewer connection. I had a hard time when I had to replace. Dropping the belly was easy, reinstalling was harder. Re the valve itself, I worked for hours and could not get the replacement in, just too tight. I ended up cutting the old one out and re routing the sewer line. i had the correct cable/valve kit, but took a couple of trips to lowes and a very handy neighbor before we got it back together. Re your draining issue, it goes without saying that as the liquid drains out, solid buildup results.