I just purchased a 2001 Expedition DP (first time RV) and I have not been able to locate the low point drains to sanitize the system. I have looked in every compartment and have looked under the RV for pipes.
The book says in the utility compartment but all I see is the shower, city water, power, cable, and black water sanitize. No low point drain valves. I assume the water is fine but I am trying to test and get expertise on it before I head out somewhere.