PPR Stable Composite Pipe 1>More safe,attractive 2>Long Service life,non-toxic 3>Chemical agents proof 4>Recyclable PP-R/AL Stable Composite Pipes Features Five-storey structure, layers of protectionPP-R aluminum-plastic stable composite pipe has five-storey structure, the mid-layer is welding aluminum tubes, the inside and outside tube is PP-R Plastic, both the inside and outside tube between ...