Witches hat strainers, also called temporary filters or cone strainers, are installed upstream of pumps and other equipment in the piping system. Witches hat strainers remove unwanted debris and impurities from the process stream, preventing damage to sensitive system equipment. There are three types of temporary strainers: witches hat strainers https://www.yubofilter.com/news/witches-hat-strainer-flow-direction.html