Instead of sending crankcase ventilation gas (hot engine oil vapor) back into your intake or releasing into the atmosphere, an oil catch tank can be fitted after the crank case breather outlet and will collect the vapor over time. Oil droplets, un-burnt fuel, and water vapor will condense and settle in the tank. This stops them from reaching the intake and problems caused by intake routed crankcase breathers.
This item is available in a few different anodized color choices. Easily cleanable by draining the oil from the catch can.