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I also have a 2021 Cougar 22RBS. On the drivers side of the bed you will notice an additional carpet covered compartment that is not on the passengers side. Inside this compartment is the water pump. The carpeted lid will pull up and expose the pump and associated plumbing. The manufacturer does not install a winterizing kit, but they are available online. Bought mine on Amazon.
You will also need to rotate the hot water bypass valve to prevent the rv antifreeze from getting into the hot water heater. Remove the panel which is on the left side of the door next to the power center. Should be two screws. Behind the panel you will see the hot water heater and on the back side of it towards the top you will find the bypass valve. As long as you are a contortionist you should be able rotate the valve a quarter turn bypassing the hot water heater.
Don't forget to drain the hot water heater.
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