PTFE Diaphragm, 2/pk Back Catalog number: 11-2891 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-10600 Check Valve Cartridge, 2/pk Price on request 11-2401 Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Price on request CTS-11092 O-Ring, PTFE Price on request