Backup Seal Back Catalog number: CTS-2963 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21015 Ferrule, 1/16", SS, 3/pk Price on request CTS-A094 Check Valve Cartridge, 2/pk Price on request CTS-5531-05 Solvent Bottle Filter, 5/pk Price on request