Outlet Check Valve Assembly Back Catalog number: CTS-0721 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21480 Check Valve, Cartridge Price on request CTS-11149 Needle Seal O-Ring, 002 Kalrez Price on request CTS-11335 ACQUITY H-Class QSM Performance Maintenance Kit Price on request