Foshan Deneng Air Energy After-sales Service Center warmly reminds you: Did you choose the right pipe for air energy installation? No.1: Aluminum-plastic pipe (not recommended). It has the advantage that it can be bent at will like a copper pipe, and it is easier to install. If a good aluminum-plastic pipe is used, it is not easy to cause problems, because there is a layer of aluminum in it, that is, three or four layers. It is the pipe fittings that are prone to problems in zui. Our zui has long used copper fittings, and there are two kinds of copper fittings. The first one is pure brass. That copper fitting is very expensive, about 20 pieces for a small one, and valves.