Your black water tank is full and the drain valve is stuck.
Black water tank valve.
The black tank should only contain the biodegradable enzymatic product of your choice your solid and liquid waste and septic safe toilet paper nothing else.
Let that drain completely as well and then close it.
Run about 5 gallons of water into the gray water tank through the kitchen faucet.
If you just want the valves they re available in two different sizes.
The first one is a freshwater tank that stores fresh water.
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Flush valves allow you to rinse your black water tank and flush out your sewer hose in order to break up clogs and clean your tank sensors.
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It holds dirty water from your toilet.
Pull the black water valve and let the tank drain completely.
The second is a grey water tank that holds dirty water from your kitchen sink and shower.
The last one is the black water tank.
Connect a garden hose to the barrel see image then choose either the tank setting or the hose setting to direct the flow of water where you need it.
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1 5 for gray water tanks.
Make sure to purchase the appropriate assembly for your needs.
3 for black water tanks.
With the wastewater valves closed and the black cap off place a 5 gallon bucket under the sewer drain port.
It s located under the rv carriage positioned next to the grey tank which holds the water run off from sinks and showers.
That will be the smaller wastewater valve.
The black tank collects the waste from the toilet.