Liquid Wrench (RVL512/6PDQ-6PK RV Dry Lubricant - 11 oz, (Case of 6) LIQUID WRENCH is a local family owned company based out of Charlotte, NC. For more than 75 years, LIQUID WRENCH products, developed by the people who use them, has earned the trust of hard-working tradesment and the active DIYer through consistent, superior performance and a commitment to innovation. Specifically formulated for RV slide-outs Cuts friction and extends life Dry film with no oily residue