Outlet Check Valve Back Catalog number: CTS-A121 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-10396 Washer Thermo/Dionex™ Model: P1000, P2000, P4000 Price on request CTS-A11095 Check Valve, Double Ball & Seat Price on request CTS-10597 Wash Tube Seal Kit, 4/pk Price on request