Make cut-out Ø 40.5+0.5 mm in enclosure wall for size M40 or Ø 12+0.2 mm for size M12, and mount pressure compensation device with nut. Please make sure that the sealing gasket is put in place on the outer side panel of the enclosure. For optimal pressure compensation we recommend to use two devices on opposite sides towards the top of the enclosure.
1 at a pressure difference of min. 70 mbar