Check Valve Cartridge, 2/pk Back Catalog number: CTS-10600 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-A11095 Check Valve, Double Ball & Seat Price on request CTS-A11145 Tube Assy, System Outlet, SDS Price on request CTS-0038 Tube, Right Inlet Pigtail Price on request