Two-Battery Control Box with Harrier EZ Controller and Includes ASC 24/12 Two Panel Charge ControllerWhen specifying the correct chemical injection system, its important to ensure the correct control box configuration is used to ensure proper operation. Graco offers plastic or steel boxes, AC and DC powered, plus standard options all the way up to NEMA rated box options to help meet the chemical injection application requirements. The Modular Control Boxes are customizable so the correct configuration can be achieved based on your application needs.