Jacuzzi Magnum Plus And Magnum Force Pump Seal Housing 1.5-3HP FR 5HP UR On this Seal Housing there is a raised section around the front where the Impeller sits, about 1/4" tall. There is a 1/4" X 5/16" notch on the outside edge. This raised section extends all the way to the outside screw holes. Measuring the inside diameter of the raised section should be: 5-1/4" and extends to the outside edge. Outside Diameter: 7-5/16" (A) This Is The Maximum Diameter At The Motor Side Front To Back: 2-1/4" (B) Outside Diameter: 6-9/16" This Is At The Front Where There Are 9 Small Holes Around The Outside. There Are Also 3 Additional Holes On The Front