Part Number: SPX0710XD Gasket 1 Pcs in Package Measurements:Outside Diameter: 5-5/16";Center Hole Inside Diameter: 3/4";Thickness: 9/32" (top to bottom);Spoke Thickness: 7/32" (side to side);Outside Ring Thickness: 7/32" (side to side) Compatible with Hayward SP0710, SP0711, SP0712 Series vari-flo multiport valves.