WFIF welded stainless steel filter housings with flange connections are designed for the filtration of compressed air as well as many other gases where the risk of corrosion is very high or where a stainless steel housing is required. The quality of compressed air required in accordance with ISO 8571-1 can be achieved with 8 different grades of filter element (PI, PIW, PN, PP, PR, PM, PS and PA). Fluid group 1 on request. External condensate drains (optional) must be used for efficient condensate drainage.