Rheem/Protech AS-46546-85 - Top Plate/Collector Box Kit - Rheem/Ruud/P Rheem/Protech AS-46546-85 - Top Plate/Collector Box Kit - Rheem/Ruud/Protech - A complete line of OEM and factory replacement parts for your furnace; air conditoner; water heater; air handler; boiler; rooftop unit and more.