The problem of engine crank case breathing must be considered when preparing a wet sump car for competition.
To avoid oil being deposited on the track, the rules state that the oil bearing vapor must be either returned to the engine or to a suitable tank where the oil may be trapped.
The normal system of sending the oil to the inlet manifold is undesirable in a high performance engine.
Made of aluminum, with a special cap incorporating a breather, there are two 1/4BSP female ports with adapters to 1/2″ hose on one side and a sight tube on the other.