... &pex-al-pex pipes 2.CW617N,CW602N Jieanju straight brass compression fitting is made of brass body,brass nut and seal ring ... be CW617N, CW602N, Hpb59-1, Hpb58-2, Hpb58-3, etc; fitting superficial treatment can be tin-plating and nickel-plating.Both ... can connect pert-al-pert and pex-al-pex pipes, compression fittings are easy to install, just tighting nut into body ...