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My method for draining the rear water tank is to open the hose spigot and let the pump empty most of the water. Then I remove the white threaded plug on the right side of the tank to get the rest of the water out. I'm sure somebody on this board, smarter than me, will figure the thread size and come up with a valve or similar to make it easier.
Thats the correct way to empty the tanks. Its an Australian thing. So far every Australian trailer we have received does that as well.