Reduce or even eliminate the oil coming from the head breathers on your M8Machined from Billet Aluminum with a Boyesen one-way reed valve to vent the excessive crankcase pressureNo annoying hose on your dipstick to worry about when checking your oilProven on the Trask Performance King of the Baggers Race BikeFree up horsepower on M8 engines by allowing to rev easierIncludes hose and breather filter