Product Details: The Donaldson 3.66" 3-Micron Spin-On Hydraulic Breather is designed to provide reliable protection. This Spin-On breather is constructed using high-quality materials to withstand the demands of hydraulic systems and features a 3/4" thread size which is commonly used for hydraulic applications. The Spin-On design provides a secure and convenient installation process and the 3-Micron filtration ensures that your system is protected from dirt and other contaminants. With regular maintenance, this breather will help to ensure the optimal performance of your hydraulic system. FleetPride is your First Click in Heavy Duty®.