The BR210 is designed to filter our airborne solid particles before it enters the hydraulic reservoir and contaminates the hydraulic system. As the oil level drops in the oil reservoir, airborne solid particles get drawn in. These solid particles are typically very abrasive and can have a "sand blasting" effect to the hydraulic systems internal components. Depending on the selected filtering level of the hydraulic oil filters, they may not be able to effectively capture and remove all the particles after they have been drawn in through the reservoir. The most effective and cost efficient way to protect the system from the airborne solid particles is to block them from entering in the first place by installing the BR210 breather.