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-11092 O-Ring, PTFE Price on request CTS-10319 Sapphire Plunger Price on request CTS-2294-04 Plunger Seals, 4/pk Price on request