The Baldwin 5-3/8" Spin-On Coolant Filter is designed to remove contaminants from the engine cooling system. It is also designed to be used with Balanced Treatment Additive Plus, a phosphate/molybdate/nitrite-based inhibitor used to protect your engine from corrosion and rust. This filter is easy to install and helps you maintain your engine's cooling system for optimal performance. FleetPride is your First Click in Heavy Duty®.