O-Ring, PTFE Back Catalog number: CTS-11092 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-A11342 Tube Assembly, Transducer to Check Valve Price on request CTS-10839 Seal Pack Rebuild Kit Price on request 11-2401 Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Price on request