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Hello, neighbors and friends, Steve here with Etrailer. Today we're looking at the Thetford RV drain valve lubricant for your black and gray holding tanks. That's right, folks. So this is a holding tank additive for either your black or gray water tanks. It's gonna lubricate the tanks, the drain valves, and the plumbing lines. And like I said, it works in both gray and black water tanks.… see more >
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