Check Valve Cartridge, Ceramic, 2/pk Back Catalog number: CTS-21463 Availability: In the manufacturer's stock Price on request - + Recommended CTS-11335 ACQUITY H-Class QSM Performance Maintenance Kit Price on request CTS-21106 Seal Wash PM Kit Price on request CTS-6809 Mobile Phase Transfer Line, TFE, 3/16" OD x 1/8" I Price on request