Black tank won't drain...

Oh, and another little trick I learned. I got a piece of half inch copper tubing about 3' long, put an elbow on one end with a hose connection on which I placed a high pressure nozzle. Then on the other end I put another elbow to give me better control, a brass shut off valve because their stronger, and a hose connection to fasten it to a garden hose. I hold the valve down to open the toilet drain and put the nozzle down into the black water tank and my wife turns on the water. I put a clear plastic connector on the end of the drain so I can see what is coming out and you would be surprised how much stuff comes out, even though the tank shows empty. I think the tissue must get stuck in the corners or around where the pipes are connected and it builds up. The high pressure water breaks it loose. Simple little device, carry it with us in a storage compartment, use it a couple times a year.

"If I ain't DoneIt it probably ain't worth talking about".