HeatMaster RhinoFlex Foam Insulated PEX
Pex Tubing Standard size pex tubing is manufactured to SDR9 standards which is the same outside diameter as copper pipe but has a wall thickness 1/9th the diameter. 32mm size is SDR11 which means it has a thinner wall. This makes it easier to work with and more insulation compared to 1-1/4" that has almost the same ID size.
NOTE: --------------------------------------------------------------------------------------------------------------------------------------------- Pex-Al-Pex Tubing Pex-al-pex is sold as inside diameter instead of copper tube size. It has a few advantages over normal pex. It doesn't expand in length so if you have an installation that can not allow for expansion when the pex gets hot you may want to consider it. Also the sizes fall between pex so it is also a good alternative if you need something a little bigger than 1" pex.
PEX-AL-PEX is made with an exterior layer of PEX then adhesive followed by a layer of aluminum, another layer of adhesive and finally a layer of PEX. The aluminum acts as an oxygen barrier so all PAP tubing is considered OB.
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