Grundfos 98394422, Impeller Coupling, for use with Model CR 5-2, CR 5-3, CR 5-4, CR 5-5, CR 5-6, CR 5-7, CR 5-8, CR 5-9, CR 5-10, CR 5-11, CR 5-12, CR 5-13, CR 5-14, CR 5-15, CR 5-16, CR 5-18, CR 5-20, CR 5-22, CR 5-24, CRE 5-2, CRE 5-3, CRE 5-4, CRE 5-5,