Check Valve Cartridge, 2/pk Back Catalog number: CTS-10493 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-A11151 Needle Assembly, PEEK™ Price on request CTS-1010T O-Ring, TFE Price on request CTS-21100 UPLC Check Valve Assy, Spring Loaded Price on request