Raceworks Aluminium Catch Can With Drain Tap Black - 3.5LRaceworks twin inlet oulet 3 Litre catch can with internal baffling and includes drain tap. An oil catch can or breather tank is an essential step in removing PCV oil before it enters the combustion chamber, and must be baffled while providing unrestricted flow to maintain efficiency and prevent intake carbon build up. Raceworks Catch Cans have been crafted to meet the most extreme street and track conditions, and are robot welded from 5052 aluminium.