One way case reed valve breather
Eliminates positive case pressure and oil leaks. Easy installation with no modifications or machining necessary. Fits 750 left side case breather vent, 850 timing case, Combat or aftermarket lower case mount. MK3 elect start timing case with the original Prestolite or aftermarket starter (1/2″ hose barb is for Mk3 only). Universal inline hose version (more info).