I had a terrible problem trying to open the black water tank drain valve on my truck camper. Complete panic when I couldn't open it while camping in a junkyard. I ended up having to crack it open on the handle with a hammer. I read about this product and decided to try it. Fantastic! I followed the directions. I poured about 1/2 bottle into the tank and waited overnight. To my delight, this broke the seal that was causing the valve to stick, and it now works just as it did the day I bought it.
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