RHT PEX-AL-PEX pipe is a composite pipe consisting of five layers.The inside and outside layers are made of high-density polyethylene (HDPE) cross-linked (PEX) tightly bonded with adhesive to the mid-layer of an aluminum core which is longitudinally welded in an overlapping manner. All layers are extruded in one step.

The inside and outside layers are of special PE, hygienic, toxic-free, and smooth. The middle layer of AL is 100% gas/oxygen tight, giving it the same advantages of both metal and plastic pipes.