As a general rule suitability of the frabopress pressfittings (Copper/Bronze, Stainless Steel and C-Steel) for this application is related to the oil content of the compressed air. In case the oil quantity is below 5mg/m³ any of said systems can be used as supplied.
In case the oil quantity is over said threshold we require the oring to be changed with the red FKM oring which features a unique resistance to oils, mineral greases thus granting higher performances.
Maximum operating pressure is, in any case, 16bar.
Please avoid the build of condensate inside the C-Steel sytems using dry air.