Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request PL7025350 MarvelXACT PLS 25µm x 350mm Price on request 11-4133 Gold Plunger Seal Price on request