Radium Catch Can Kit, Competition Catch Can Extension Upgrade The competition catch can extension is an upgrade specifically for customers who have the CCC short version. It includes a O-ringed anodized aluminum section that screws into the center of the existing catch can. This will increase the volume of the catch can to 1 quart. The Radium logo is laser etched on both sides of the canister.ONLY COMPATIBLE WITH THE RADIUM COMPETITION CATCH CAN. Not compatible with Radium standard catch cans.