The first one is a freshwater tank that stores fresh water.
Black water tank valve.
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To determine which valve is leaking you should have your rv waste tanks empty.
If you just want the valves they re available in two different sizes.
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.
Some rvs might lack the grey tank the black tank contain all the dirty water from the kitchen sink toilet and showers.
Pull the black water valve and let the tank drain completely.
Make sure to purchase the appropriate assembly for your needs.
1 5 for gray water tanks.
It holds dirty water from your toilet.
Run about 5 gallons of water into the gray water tank through the kitchen faucet.
That will be the smaller wastewater valve.
Let that drain completely as well and then close it.
The last one is the black water tank.
The black tank collects the waste from the toilet.
Your black water tank is full and the drain valve is stuck.
3 for black water tanks.
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With the wastewater valves closed and the black cap off place a 5 gallon bucket under the sewer drain port.
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.
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.
The second is a grey water tank that holds dirty water from your kitchen sink and shower.