Dual Catch Can Kit Radium Engineering for Ford Focus ST 2015-2018 Fluid Lock - USA-RAD-20-0358-FL - An oil catch can is essential on a performance vehicle to protect the engine from elevated levels of crankcase blow-by accumulated from high performance driving. Excess oil saturated air circulating back into the air intake stream can lead to degraded performance. Click the MORE DETAILS tab to learn more about Radium oil catch cans. Focus Eco Boost Catch Can Kit Details Radium Engineering catch cans feature large 10AN ORB ports, a 4AN ORB drain port, 2-step oil separation baffling, and an O-ring sealed dipstick. These kits mount using factory holes and integrate perfectly with the surrounding components. These two oil catch cans (PCV  and CCV) function completely independent of each other and are sold individually or together. They do NOT vent to atmosphere (VTA), thus are emissions and track legal. Closed loop systems remove the oil and sludge from the PCV gasses before it is routed to the engine to be burned. A closed loop system also promotes negative crankcase pressure for optimal performance. Furthermore, closed systems prevent unwanted oil vapors from entering the cabin. The dipsticks built into the catch cans allow easy inspection of accumulated fluid. No cutting, drilling or permanent modification to the vehicle is required. Dual Catch Can Kit 20-0358-FL Compatibility: 15-18 Focus ST Requires Radium 20-0356 Sound Symposer Delete Kit The two catch can kits (PCV and crankcase) mentioned above can be purchased together using part numbers 20-0328-FL (Focus RS) or 20-0358-FL (Focus ST).  Instruction PDF