The advantages in an overview: in the field of water applicable for pipes PE 80 (PN 12,5) and PE 100 (PN 16) acc. to DIN 8074/75 and GW 335 as well as for pipes PE-Xa (PN 12,5) and PE-Xc acc. to DIN 16892/93 cold and warm water resistant hot water resistant up to 95° C* gas resistant up to DN 40* (operation pressure 4 bar) also for district heating conduits* made of thermally unstressed and dezincification resistant brass material acc. to DIN 50930-6; thus no additional inner corrosion protection is necessary permanently safe sealing and thus applicable in places that are not accessible later absoluty tension-proof with roughened male thread