Check Valve Cartridge, 2/pk Back Catalog number: CTS-A094 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-2891 PTFE Diaphragm, 2/pk Price on request CTS-21347 Plunger Seal Price on request CTS-21287 Needle Kit, 15 µL with Needle Seat and Needle Guid Price on request