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Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
My info isnt showing the exact location of the drain on your model but you will have either a drain tube hanging down that has a small cap on to remove to drain it ( and the drain is usually on the same side and area as the tank fill) or a plug that unscrews at the bottom to drain it.Some models it is near the water pump itself and has to be accessed from inside the vehicle.It looks like Bigfoot RV's were common to have the drain at the water pump area accessed from inside.
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