Inlet Check Valve Cartridge Back Catalog number: CTS-0621 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-A11431-02 Cartridge Check Valve Housing, 2/pk Price on request 11-4181 Seal Wash (0.0787 ID, Fixed), 2/pk Price on request CTS-10692 HPMV Gold Seals, 2/pk Price on request