Check Valve Cartridge, 2/pk Back Catalog number: CTS-A094 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended 11-2569 Seal Extension Tube Price on request CTS-10686 Needle Seal, Vespel® Price on request 11-2525 1/4" Short Comp. Screw (Gold-Plated), 10/pk Price on request