Electrical installation pipe, flexible/corrugated, non-flame propagating, FK-MF according to DIN EN 61386-22 (VDE 605-22):2011-12 / DIN EN 61386:2004 + A11:2010 For laying in concrete, screed and flush-mounted installations, as well as for laying in machine and system installations. Version with the highly slippery inner coating SUPERSPEED.