Product Details: The Meritor 3/8" NPT Drive Axle Breather And Tube are designed to prevent the formation of a vacuum or excessive pressure within the axle assembly. It is designed to withstand the harsh conditions of the environment, ensuring proper ventilation and pressure equalization. It is installed on the drive axle housing typically at a designated breather port. This breather and tube is a reliable and durable solution for your axle assembly needs. FleetPride is your First Click in Heavy Duty®.