A duplex strainer is an industrial filter for fluid systems that allows for continuous, uninterrupted filtration by using two separate filter baskets and a diverter valve to switch flow between them. When one basket becomes clogged, a valve redirects the flow to the second, clean basket, allowing the first to be removed, cleaned, and replaced without stopping the system’s operation. This feature makes duplex strainers essential in industries like oil and gas, chemical, protecting pumps, pipelines, and other equipment from debris and contamination.