Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Back Catalog number: 11-2401 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-10772 Pump Seals, Low Pressure Price on request CTS-21280 Lamp, ACQUITY Arc/UPLC PDA Performance Maintenance Price on request CTS-10985 600/610 Performance Maintenance Kit Price on request