Inlet Check Valve Back Catalog number: CTS-21147 Availability: In the manufacturer's stock Price on request - + Recommended CTS-A11336 Cartridge, Intelligent Valve Price on request 11-4048 PEEK™ Needle Seal, SIL-30AC, SIL-30ACMP Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request