Catch Can Kit PCV for Honda Civic Type-R Fluid Lock Radium Engineering - USA-RAD-20-0424-FL - 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. This kit mount using factory holes and integrate perfectly with the surrounding components. These two oil catch cans (PCV side and CCV side) 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. 20-0424-FL Catch Can Kit, PCV, 2017+ Civic Type-RCOMPATIBILITY17-21 Honda Civic Type-R FK8 (LHD Only)2023+ Honda Civic Type-R FL5 (LHD Only)The catch can secures to the RH firewall with no modifications required This catch can runs inline with the PCV (positive crankcase ventilation) valve and retains it's factory function. When the intake manifold pressure is close to or greater than atmospheric pressure, the PCV "check" valve closes and, thus, this hose experiences no flow. Conversely, the PCV hose will experience "metered" vacuum when the engine is idling, steady state cruising, and decelerating. This would normally draw unwanted crankcase vapor, unspent fuel, and oil sludge into the intake manifold immediately after a high load run. Note: No inline check valve is required since Radium catch cans are pressure sealed. This means a direct intake manifold connection is permitted. Instruction PDF