Grundfos 98371207, Chamber W. Bearing Coupling, for use with Model CR 1-2, CR 1-3, CR 1-4, CR 1-5, CR 1-6, CR 1-7, CR 1-8, CR 1-9, CR 1-10, CR 1-11, CR 1-12, CR 1-13, CR 1-15, CR 1-17, CR 1-19, CR 1-21, CR 1-23, CR 1-25, CR 1-27, CR 1S-2, CR 1S-3, CR 1S-4