Needle Assembly Back Catalog number: 11-3883 Availability: In the manufacturer's stock Price on request - + Recommended 11-1596 Piston Assembly, Sapphire Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request CTS-21012 Compression Screws & Ferrules, 1/16", SS, 5/pk Price on request