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 11-4150 Tubing D-R Assembly Price on request CTS-0620 Outlet Check Valve Cartridge Price on request CTS-21463 Check Valve Cartridge, Ceramic, 2/pk Price on request