HELP! Black tank Clogged

If you use the cap w/ garden hose nipple you'll need a female-female hose. I use an old one I saved off DW's washing machine after I replaced them on GP. Be sure the TT valve is open before you turn the water on, else you'll blow the drain pipe and / or valve.

Since my sewer cleanout is in my front yard and can be reached with a sewer hose extension I back flush my gray and black tanks before putting the TT away for the winter.

Vet Man wrote:
Put a cap with a water hose connection on it, Wal-Mart has them. Turn on the water and blow the clog back into tank, make sure not to overflow the tank. Then dump the normal way. I saw a RV repair man do it this way. Charged a $100 to come to site to do it.

This is what a Flush King or Hydro Flush will do. It allows you to back flush the tanks. Have been using them for years whenever dumping and never a problem.

My black tank has 2 valves on it, one near the tank and the other near the sewer connection. If the RV is new to your friend, maybe he has the same and didn't know about the valve near the tank, if he has 2 valves.

Otherwise, backflush as Vet Man says.

turbopilot51 wrote:
Buy a Flush King valve and flush several times until clear.

+1 I've found this to be the easiest solution assuming the gate valve is really open.

2x on the possibility that the valve handle has come loose and the valve is not really open. I have the idea of using the cap with a hose fitting to force water in the opposite direction filed away.

Tell them to hold their BREATH for about 5 min AFTER they open the valve when the clog breaks free. :R

Buy a Flush King valve and flush several times until clear.

VET MAN has a great post, simple almost clean. and should work.

fill it up with water untill you cant anymore. let sit and then drain. If monitor panel still reads fulls and stuff comes out of tank. probably dirty sensors or a bad ground on sensors. Good luck

If nothing comes out, how do you know the valve opened. Did the handle or cable come off the valve?