This is the direct replacement transformer fan-relay for many Rheem, Ruud, and Weatherking models. This includes a transformer with terminal strip and a plug-in relay mounted on a 4-1/4" X 4-1/4" plate. The replacement relay is available individually as part number R-42-25104-06. This part replaces Rheem Ruud Weatherking fan centers 47-19807-03, 47-19807-05, and 47-25089-03 and transformer part numbers 47-19807-01, 47-19807-02, 47-19807-04, 47-19230-01, 8406-5519, 8406-5529, and 8406-5531.