No extra inline check valve is required since Radium catch cans are pressure sealed. The PCV catch can kit runs inline between the PCV valve and the intake manifold and promotes clean filtered air back into the engine.
Radium Engineering 8AN ORB Direct Mount Regulator-Rotating Assembly (DMR-RA)-Blk
Radium Engineering Multi-Port Regulator Rotating Assembly (MPR-RA) - Black
Radium Engineering 20-0014 Fuel Pressure Regulator
Radium Engineering RA-Series Fuel Pressure Regulator Conversion Kit - Black
Radium Engineering Direct Mount Regulator Remote Adapter Kit
Radium Engineering Fuel Rail For Mazda Miata MX-5 94-05 NA NB BP 1.8L 20-0369
