Check Valve Cartridge, Ceramic, 2/pk Back Catalog number: CTS-21463 Availability: In the manufacturer's stock Price on request - + Recommended CTS-11435 Seal, Needle PEEK™ Price on request CTS-10323 Sapphire Plunger Price on request CTS-10560 Seal Wash Plunger Seal, Alliance, 2/pk Price on request