Product Details: The Truck-Lite NYK-77 Series Corrosion Preventative Compound is a great way to protect your electrical contacts, switches and junction boxes from corrosion. This compound is designed for periodic use with all electrical contacts not using Fit 'N Forget connectors. It comes in a convenient tube and is available in a variety of sizes to meet your needs. This corrosion preventative compound is easy to use and helps to ensure that your electrical contacts remain in top condition. FleetPride is your First Click in Heavy Duty®.