ThermoPEX is flexible pre-insulated piping consisting of two waterproof oxygen barrier PEX-A lines (supply and return) protected by polyurethane closed cell foam insulation and a thick, durable, waterproof polyethylene outer jacket.
It is the ideal insulated piping for use with outdoor wood furnaces.
The outside diameter of 1" ThermoPEX is 4-3/8".
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