Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-11010 515 Performance Maintenance Kit Price on request 11-4179 HPV Rotor, SIL-30AC, SIL-30ACMP Price on request CTS-A138 Ceramic Plunger Assembly Price on request