The Wirsbo Expander Tool can only be used with PEX-a quality tubing. PEX can be made using three distinct processes, creating PEX-a, PEX-b, and PEX-c quality. PEX-a is the highest quality PEX available, the PEX that is most uniform in nature and the PEX that is able to keep a memory of its shape and return to that shape after expansion. When using the Wirsbo Expander Tool, you will stretch the PEX tubing out to the point where PEX-b or PEX-c would not come back, and thus would not create a secure connection. PEX-a's superior quality allows it to be expanded to fit over the fittings and within seconds return to its shape forming snugly around the newly inserted fitting.
Radiant Heat PEX and pipe for PEX Plumbing can be found at www.supplyhouse.com
