... Applications:Connecting pipes,suitable for cold water,hot water and gas applications...brass press fitting coupling (union) is made of brass body,EDPM ... steel SUS 304 sleeve and plastic ring.Brass body material can be CW617N, CW602N, Hpb59-1, Hpb58-2, Hpb58-3, etc; ... brass body superficial treatment can be tin-plating and nickel-plating.Two sides ...