Needle Seat Back Catalog number: 11-2570 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-00230-02 O-Ring, PTFE Price on request CTS-21164 Rotor Seal, 6 port, Rear Price on request CTS-10285 TFE 3-Way Valve 4 (V4) Price on request