One way 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 Maney case lower sump mount. MK3 elect start timing case with the original Prestolite or with shorter aftermarket starter. Universal inline hose version (also replaces 961 oil separator). And and all front Tac mount locations. (more info).