Check Valve Cartridge, 2/pk Back Catalog number: CTS-10600 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-2891 PTFE Diaphragm, 2/pk Price on request CTS-10758 Pump Seals, High Pressure Price on request CTS-00230-02 O-Ring, PTFE Price on request