Radium Coolant Expansion Tank OEM location - Elise/Exige 06-11 (2ZZ-GE)This kit is compatible with all S2 Elise and Exige models that use the Toyota 2ZZ GE engine (N A or supercharged). The Radium Coolant Expansion Swirl Tank features three ports that use 6AN male adapters (not tapered pipe threads) for a positive seal. The main tank is a 2 piece design constructed of billet aluminum. The two halves are bolted together along with a CNC billet aluminum cap receiver which mates to any standard 32mm "Type A" style pressure