This is a Pentair C5-247 5 HP Medium Head Impeller for Commercial D-Series 5 HP Self Priming Centrifugal Pool and Spa Pumps.
Pentair Medium Head Impeller: Outer Diameter: 5-13/16 Inch, Thickness: 1/2 Inch (Total Thickness), 3/8 Inch (Inside Vane Thickness at Outside Edge of Impeller).
