1100 Series Essential Pack, G1310A/G1311A Pump Back Catalog number: CTS-21586 Availability: In the manufacturer's stock Price on request - + Recommended CTS-21469 250 μL Syringe, High Pressure Price on request CTS-5313 Compression Screw, SS Price on request CTS-11149 Needle Seal O-Ring, 002 Kalrez Price on request