Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-4122 PTFE Diaphragm, LC-30AD/i-Series, 2/pk Price on request CTS-21586 1100 Series Essential Pack, G1310A/G1311A Pump Price on request CTS-21243 1/16'' Ferrule set, 2/pk Price on request