Impeller Jabsco 4598-0001 replacement by Ancor of Italy.
Impeller Specifications

‘(A) Diameter in mm - 65
‘(B) Depth (Blade length) mm – 50.8
Number of Blades – 8
‘(D) Shafts insert Diameter mm – 16
Shaft type – 3 (key way)
Impeller (Rubber) Material - Neoprene
Replaces:
Jabsco Impeller 4598-0001
Oberdorfer Impeller 6603
Used on Oberdorfer M405/404 pumps
Volvo Penta 818680 (no longer in production)