1100 Series Essential Pack, G1310A/G1311A Pump Back Catalog number: CTS-21586 Availability: In the manufacturer's stock Price on request - + Recommended CTS-21100 UPLC Check Valve Assy, Spring Loaded Price on request CTS-21171 Rotor Seal, H-Assy, 6 Port 2-Position Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request