Remove any pressure from the water system by shutting off pump or city water supply and open a faucet to remove any pressure so you can remove both caps and then close the faucet. (some amount of water may drain out but that's OK)
Hook to city water... turn on the city water supply.
Water will come gushing out the plumbing system low point drain when hooked to city water pressure.
Even if there is water in your fresh tank and it is draining, you won't see any increase in drain flow from the fresh tank drain. If the fresh tank is empty, nothing will come out that line.
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel
Ford F-Series SCREW 4x4
TST Tire Monitor - Sinemate 3500w Gen.
2016 Nights Camped = 46