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Argo Zone Valve Controls Are Clearly Marked For Easy And Accurate Installation. Argo Zone Valve Controls have a sturdy construction for long lasting durability. They are compatible with all types of thermostats and have a front window with clearly visible LED, diagnostic lights for easy troubleshooting. Expandable up to 10 zones with priority utilizing two Az controls. Choose from 3 Zone, 4 Zone, 5 Zone and 6 Zone models. Comes in a sleek, black color for an attractive look. Dimensions and horsepowers vary.