Check Valve Cartridge, 2/pk Back Catalog number: CTS-10600 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21564 Needle, Uncoated 10 Series Price on request CTS-10686 Needle Seal, Vespel® Price on request CTS-5464 Clip Ring, Plunger Retainer Price on request