Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21183 Peristaltic Pump Price on request CTS-11435 Seal, Needle PEEK™ Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request