How do you switch between holding tanks.
This might be a dumb question. I just purchased a new trailer and I noticed on the display panel it has two black tanks and two grey tanks. The exterior only has one drain location, with two pulls,...
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You'll have a pull handle for each tank. My old unit had three tanks. There were three pulls. I painted the gray ones with silver spray paint so I would know they were gray water. There's nothing like accidentally dumping sewage when you thought you were dumping just sudsy water.
