Needle Seal (For pH 1-14, for operation up to 130 Back Catalog number: CTS-21089 Availability: In the manufacturer's stock Price on request - + Recommended CTS-21480 Check Valve, Cartridge Price on request CTS-12016 Compression Screw, 1/16", SS, 10/pk Price on request CTS-A11094-02 UPLC Primary Check Valve Assy, 2/pk Price on request