The DUOPEX GAS pipe is a multi layer or composite pipe system.
It consists of an inner layer of cross-linked polyethylene (PE-X), an adhesive layer, an aluminium layer, an adhesive layer, an outer layer of cross-linked polyethylene, which is effectively a 5-layer pipe.
The pipe has been tested in accordance with AS4176 and carries license number 21044 and Standardsmark.