The Dana Spicer Breather Kit, part number 17777/441 or 17777441, is a genuine Dana Spicer replacement breather kit designed for on-highway axle applications. Axle breathers relieve pressure buildup inside the axle housing, helping prevent seal damage and fluid loss under normal operating conditions. This kit supplies the correct breather components for the application and is sold directly by Pro Gear and Transmission. Call us to confirm this is the right part for your specific axle before ordering.FeaturesGenuine Dana Spicer breather kitPart number 17777/441 or 17777441Designed for on-highway axle applicationsHelps relieve axle housing pressure to protect sealsSold by Pro Gear and Transmission