Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-2569 Seal Extension Tube Price on request 11-4122 PTFE Diaphragm, LC-30AD/i-Series, 2/pk Price on request 11-4181 Seal Wash (0.0787 ID, Fixed), 2/pk Price on request