Rotor Seal, 6 port, Rear Back Catalog number: CTS-21164 Availability: In the manufacturer's stock Price on request - + Recommended CTS-21240 ACQUITY I-Class SM-FTN Performance Maint. Kit,2890 Price on request CTS-2294-04 Plunger Seals, 4/pk Price on request CTS-11141 ACQUITY SM Performance Maintenance Kit, 700005236 Price on request