Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-2891 PTFE Diaphragm, 2/pk Price on request CTS-A094 Check Valve Cartridge, 2/pk Price on request 11-4121 Ceramic Plunger Holder Assembly, LC-10ADvp Price on request