I'm new to Geothermal and I have a local company that I hired to install and spec the system. I installed the radiant throughout the house using Pex Al Pex. It was easier to manage and was told it transfers heat more efficiently as well as less expansion noise. The company hired attempted to connect the pex al pex to the manifolds and almost every fitting leaks. Because I installed the piping they want me to install the fittings to the manifold they claim they just don't work with Pex al Pex. After doing some reading I've figured out that. 1. They didn't prepare the tubing by reeming each pipe out. This made the o-rings roll on install and leak. 2. The manifolds have copper male MPT fittings. This is one I can't figure out because there were several that leaked at the threaded end as well. Teflon was used on each of these connections. My question is... 1. Do I sweat on new compression pex al pex fittings and forego the threaded MPT? 2. Any additional tips or tricks would be helpful.