Feuling Cylinder Head Breathers For Harley Milwaukee-Eight Feuling Cylinder Head Breathers for Milwaukee-Eight are machined from billet 6061 aluminum with square surfaces for good umbrella valve sealing, as well as longer main breather exit nipples with twin O-rings for improved breather system sealing. Properly sized and located breather inlets for optimal engine breathing. The unique design maximizes breather volume while allowing for simple serviceability. Multiple drain ports are installed on the inside floor of breather bodies openings are chamfered on the ID to facilitate easy drainage but squared off on the exits to prevent filling with splash oil. Features: Anodized Feuling red Breathers can be used with external venting via dipstick, trans cover and air cleaner Kits include: pair billet breather housings, billet covers, breather filter elements, umbrella valves and quality hardware Made in the USA Note: Rocker Cover Gaskets purchased separately. Note: The Factory plastic OEM breathers can be problematic, we find the material easily distorts, especially after seeing excessive heat then the internal umbrella valve struggles to seal, causing oil carry over. Another issue found with the OEM breathers is cracked and or broken exit nipples which can be caused by heat distortion and or improper fit and poor installation.