PEX-a Tubing refers to PEX Tubing that is made using the Engel method. This method refers to the crosslinking process used when the PEX is created. The resulting PEX is stronger then PEX-b and PEX-c tubing which are made using other methods. PEX-a Tubing may be used for either Radiant Heat or PEX Plumbing. All of the PEX Tubing sold on SupplyHouse.com is PEX-a Tubing.
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