Check Valve, Secondary Inlet Back Catalog number: 11-1600 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-A121 Outlet Check Valve Price on request CTS-11121-02 Wash Seal, 2/pk Price on request CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request