Check Valve Cartridge, Ceramic, 2/pk Back Catalog number: CTS-21463 Availability: In the manufacturer's stock Price on request - + Recommended 11-1602 Seal, Polyethylene, High Pressure, Piston Price on request 11-4052 Needle Seal, SIL-30AC, SIL-30ACMP Price on request CTS-5531-07 Solvent Bottle Filter, 7/pk Price on request