Pressfitting systems for Compressed Air Installations, LABhttps://www.racmet.com/ru-ww/pressfitting-systems-for-compressed-air-installations.aspxDepending on the residual oil present in the compressed air lines, it will be necessary to check that the EPDM O-Ring is suitable, or if necessary, replace it with the FKM O-Ring. For example, for compressed air in class 5, with an oil content that is higher than 5 MG/M3, it is recommended to use the FMK O-Ring, resistant to oils and hydrocarbons.