Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-5531-07 Solvent Bottle Filter, 7/pk Price on request CTS-10597 Wash Tube Seal Kit, 4/pk Price on request CTS-10566 Alliance Head Plunger Seal Kit, 2/pk Price on request