Check Valve Cartridge, 2/pk Back Catalog number: CTS-A094 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 228-35146-00ASP Plunger Seal for Shimadzu Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request 11-2588 Main Piston Seal Price on request