Cartridge Check Valve System Kit Back Catalog number: CTS-21011 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended CTS-10761 HPMV 1 & 2 Rebuild Kit w/Spool Price on request CTS-A106 Rotor Seal Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request