WFIW welded stainless steel filter housings have been specifically developed for the filtration of compressed air as well as many other gases (for a list of suitable gases, contact your local dealer) where the risk of corrosion is very high or where the presence of a stainless steel housing is a prerequisite. To provide the required quality of air (or any other gas), the appropriate filter element must be inserted in the filter housing. Fluid group 1 on request.