Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-10985 600/610 Performance Maintenance Kit Price on request PL7050350 MarvelXACT PLS 50µm x 350mm Price on request CTS-21192 Cartridge, BioAcquity, I2V Price on request