Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-11010 515 Performance Maintenance Kit Price on request PS7025350 MarvelXACT™ PEEKsil™ 25µm ID x 350mm Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request