Inlet Check Valve Back Catalog number: CTS-A159 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-10600 Check Valve Cartridge, 2/pk Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request CTS-A11336 Cartridge, Intelligent Valve Price on request