... 20,25,32,1/2",3/4",1" 5.tin plating Our male coupling brass press fitting is made of brass ... 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.The side with SUS304 sleeve can connect the same size pipe ... until the end of the fitting; the other male side can connect the same thread female fittings or pipes ...