Seal, Wash Back Catalog number: 11-1603 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21011 Cartridge Check Valve System Kit Price on request CTS-A121 Outlet Check Valve Price on request CTS-6809 Mobile Phase Transfer Line, TFE, 3/16" OD x 1/8" I Price on request