Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Back Catalog number: 11-2401 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-5669 Oil Seal Price on request CTS-11335 ACQUITY H-Class QSM Performance Maintenance Kit Price on request 11-3601 ACQUITY H SM-FTN Performance Main. Kit,700005236 n Price on request