PM Kit, 1290 Binary Pump Back Catalog number: CTS-21421 Availability: In the manufacturer's stock Price on request - + Recommended CTS-A11431-02 Cartridge Check Valve Housing, 2/pk Price on request CTS-10285 TFE 3-Way Valve 4 (V4) Price on request 11-2588 Main Piston Seal Price on request