The heavy-duty Slide-Out Dry Lube Protectant is specially formulated to do two jobs. It lubricates and protects all metal parts of the RV slide-out assembly. Penetrates around moving parts and leaves a dry lubrication film to prevent rust and corrosion. It's an extreme pressure lubricant that's an excellent treatment for leaf springs, steering and suspension components, battery connections, and any other metal surfaces that are subject to rust and corrosion. Helps prevent rust & corrosion Great for leaf springs, batteries, & more | Thetford Protect All Slide-Out Dry Lube Protectant