There are several different options when connecting supply and return lines to a manifold. As usual there are a few questions to consider. First what is the material you would like to run as a supply and return line up to the manifolds? What size is this material? What type of manifold are you using?
If you are using brass or truflow manifolds, the end of the manifold has r32 thread. There are adapters to get from r32 thread to 3/4" PEX, 1" Copper, 1-1/4" Copper, or nominal pipe thread. If you are using a copper manifold, you can simply sweat the supply copper line directly to the manifold. There are also some manifolds that come with propex outlets for supply and return lines. These can be hooked up directly to PEX Tubing using the Wirsbo propex tool.
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