Cartridge Check Valve System Kit Back Catalog number: CTS-21011 Manufacturer: SCIENCIX Availability: In the manufacturer's stock Price on request - + Recommended CTS-0037 Tube, Left Inlet Pigtail Price on request CTS-10988 2690/2695 Performance Maintenance Kit Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request