The y-strainers with cast steel housing and flange connection PN40 are the most common filter version. The housing of this filter has a y-shape, hence the name. This type of filter can easily be placed inline as a filter system and keeps the impurities inside the strainer. This Y-strainer is suitable for water applications, compressed air, chemical and pharmaceutical industry and petrochemicals and is mainly used to protect pumps, measuring equipment and valves.