When you ve ensured the valve is shut pull the grey tank valve.
Rv grey water tank drain valve.
If the grey tank is empty fill it up all the way so you can get a lot of pressure when you open it.
This valve does not include the pull handle.
This is a mistake.
Again close when done.
One end secures to a 3 diameter rigid pipe and the other end.
This 90 degree swivel connector eliminates hose kinking while helping you drain your gray water tank.
Some people leave the gray tank valve open outside of the rv and let it drain continuously.
The standard size of a water drain valve for grey tanks on most rv s is 1 1 2.
For this 1 1 2 drain valve i have three options for you to consider.
3 4 mpt end threads into gray water flushing hose sold separately.
When both valves are open some of the water from the grey tank should flow into the black tank and put pressure on the clog.
The first option is the valterra waste valve for rv gray water tank part t1001pbc.
Try opening the grey tank valve while the black tank valve is open a few times.
Ideally you should keep the valve closed and allow the tank to fill up before dumping it.
Just as with your black tanks you want to make sure you regularly empty and drain your rv s grey water tank though it s a good idea to drain it after your black tank all that relatively clean soapy water can flush your sewer hose of the truly icky stuff.
To connect a rigid drain pipe to your rv s waste valve.
If you are lucky it will break it up.