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The blue smart card kit + spacer is an accessory set for modern heating systems, likely used for electronic control or user interface functions. The smart card may store system settings or enable specific features, while the spacer ensures proper installation and alignment. This kit is often needed during upgrades or repairs to maintain or enhance boiler or burner functionality. It is designed for easy integration into compatible systems. When installing, follow the manufacturer's guidelines to ensure correct operation. This kit is a practical solution for keeping your heating equipment up to date.