Machined from billet 6061 aluminum with square surfaces, promoting excellent umbrella valve sealing, longer main breather exit nipples with dual O-rings to promote better breather system sealingProperly sized breather inlets and location for optimum engine breathingUnique design maximizes breather volume and allows for easy servicingBreather bodies have five drain ports located on the inside floor, they are chamfered on inner diameter to allow easy drainage yet squared off on exits to prevent filling from splash oil