Can't help you on your capacities.
However, on mine, I have three pop-up valves grouped together. One each for the cold, hot and fresh water lines. The pop-up marked "fresh" drains the lines leading to and from the fresh water pump. Then there are two additional pop-ups for draining the fresh water tank. Yours should be similar.
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'03 41' Friendship & 24' trailer with HIS '03 H-D Heritage Springer, HER '15 H-D Freewheeler Trike, and '08 Smart Car.
"Adventure is found in the journey, not the destination."
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