Check Valve Cartridge, Ceramic Ball & Seat, 2/pk Back Catalog number: 11-2401 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-11222 Seal Pack Assembly Kit Price on request PL7100150 MarvelXACT PLS 100µm x 150mm Price on request CTS-21287 Needle Kit, 15 µL with Needle Seat and Needle Guid Price on request