Standard zinc die-cast filter housings are not suitable for a special application in the field of laser technology due to corrosion problems. A plastic filter block is manufactured for this purpose, which combines the pre-filter, sub-microfilter, membrane dryer and activated carbon filter in one housing. A pressure regulator for maximum pressure limitation and various connection options for measuring sensors for pressure, temperature and humidity are also integrated. The filters are easy to change thanks to the tried-and-tested bayonet lock on the filter container.