Taco Switching Relay - 4 Zone w/ PriorityClearly-labeled PC board layouts with advanced features that allow you to completely customize your system. All switching relays are UL listed, use standard "ice cube" replaceable relays and are compatible with conventional and programmable thermostats. For larger jobs, switching relays can be expanded up to 20 zones with priority. Product Specifications BRANDTaco® DESCRIPTIONSwitching Relay TYPE4 Zone S.R. w/ Priority MANUFACTURER'S PART NUMBERSR504-4
