Pressfitting systems for Compressed Air Installations, LABhttps://www.racmet.com/fr-ww/pressfitting-systems-for-compressed-air-installations.aspxIn such cases it is recommended to use pipes in AISI 316L or AISI 304 stainless steel. ... Depending 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.