Check Valve Cartridge, 2/pk Back Catalog number: CTS-A094 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-2294-04 Plunger Seals, 4/pk Price on request CTS-10493 Check Valve Cartridge, 2/pk Price on request CTS-10396 Washer Thermo/Dionex™ Model: P1000, P2000, P4000 Price on request