Lost the spring for your Revo HeaterCore? Don’t worry, we sell spares! Keeps the HeaterCore into good thermal contact with a Revo Nozzle Effective in attaching Revo HeaterCore to heatsink Compatible with Revo Micro, Revo Six, and Revo Hemera Please note this item is not compatible with V6 ecosystem heatsinks, but it is compatible with Revo Six!