Product Details: The Donaldson 3.66" 3-Micron Spin-On Hydraulic Breather is designed to make it easy. This Spin-On design provides a secure and convenient installation process and is constructed using high-quality materials to withstand the demands of hydraulic systems. With regular maintenance, this breather will help to ensure the optimal performance of your hydraulic system. FleetPride is your First Click in Heavy Duty®.