Fastwarm 12mm PEX AL PEX pipework is a low profile retro-fit pipework and is designed to be housed within one of Fastwarms low profile fixing systems. About FastWarm. Pipe PEX AL PEX, made from a 5-layer composite material using PEX (Cross-Linked Polyethylene) as the inner and outer layers coupled with a 0.2 mm thick aluminium core with butt welded construction.
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