1).Press Fitting for Pex-Al-Pex Pipe 2).Forged Brass Material 3).Certificate:ISO9001 4).Size:16mm,20mm, ... for cold water,hot water and gas applications...brass press fitting coupling (union) is made of brass body,EDPM seal rings ... .Brass body material can be CW617N, CW602N, Hpb59-1, Hpb58-2, Hpb58-3, etc;brass body superficial treatment can be tin ...