Keystone Cougar
Why would it show that my fresh water tank is full, all other tanks show empty, when I bought it Grey tank showed 2/3 full as well as black tank, they cleaned them out and drained and both showed empt...
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There is a pex drain line with a valve at the end under the tank protruding through the belly covering. Look under the trailer about even to where the fresh water fill is and you should see it. Open valve and drain the tank.
