Check Valve Assembly, Outlet Back Catalog number: 11-1599 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-4181 Seal Wash (0.0787 ID, Fixed), 2/pk Price on request CTS-A11145 Tube Assy, System Outlet, SDS Price on request CTS-11091 ACQUITY BSM Performance Maintenance Kit Price on request