mobeewan wrote:
I put about a quart or so in the black and grey tanks to keep the dump valve gaskets from drying out and sticking. That way I don't rip out the tee handles in the spring because the blades are stuck to the gaskets.
This is what I do. I do put more than a quart in the black tank, as I try to never let it sit dry. After running my Prestone RV through the lines, I drain the low points, putting this in the black tank also. My tank valves pull better in the Spring, than at time of put away. While there may be others that lubricate, Prestone RV works well for the seals, including the toilet seal.
Jerry
