PM Kit, 1290 Binary Pump Back Catalog number: CTS-21421 Availability: In the manufacturer's stock Price on request - + Recommended CTS-11149 Needle Seal O-Ring, 002 Kalrez Price on request CTS-10493 Check Valve Cartridge, 2/pk Price on request CTS-11121-02 Wash Seal, 2/pk Price on request