Forge Universal 3 Litre Catch Tank 0.5" O/D Pipes

Excess crankcase pressure (sometimes known as "blow-by") is vented from the crankcase through the PCV system, where it is drawn into the intake manifold and returned by the engine.

This recirculated air contains aerated oil from the crankcase which is burned by the engine. Supercharged, turbocharged, nitrous boosted and high mileage engines often draw excessive amounts of oil into the engine through the PCV system. The oil separator connects between the PCV hose and the intake manifold and removes aerated oil from the recirculated air and collects it in a tube that can be drained and recycled.