Rotor Seal, 2-Groove Back Catalog number: CTS-21163 Availability: In the manufacturer's stock Price on request - + Recommended CTS-21011 Cartridge Check Valve System Kit Price on request CTS-11312 PEEK™ Rotor, HPV Price on request CTS-21012 Compression Screws & Ferrules, 1/16", SS, 5/pk Price on request