Plunger Seal and Back Up Ring Back Catalog number: 11-4126 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended CTS-11335 ACQUITY H-Class QSM Performance Maintenance Kit Price on request CTS-5531-05 Solvent Bottle Filter, 5/pk Price on request CTS-21012 Compression Screws & Ferrules, 1/16", SS, 5/pk Price on request