Check Valve, Secondary Inlet Back Catalog number: 11-1600 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request CTS-5531-05 Solvent Bottle Filter, 5/pk Price on request CTS-11265 Kit S200 Standard Pump Seals Price on request