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Taco, 3/4", Zone Sentry Zone Sweat Valve, Provide On-Off, Normally Open Or Normally Closed Control In Both Open & Closed Hot Or Chilled Water Hydronic Systems, Can Be Used In A Wide Variety Of Heating & Cooling Applications, Savings & Efficiency, Patented Technology & Microcircuit Based Logic, Draws Just 1.44W When On & Is Expandable To Up To 12 Zone Valves Per Standard 40 VA Transformer, Saving On Components, Adds Up To A Zone Valve, Flow Capacity CV, Shutoff Pressure Rating, Ease Of Installation & Diagnostic Capability.