Would like advice from fellow Bolters on what piping material is the recommended for use in connecting these components. Went to Lowe's to purchase black iron or galvanized and they did not have all the fittings I needed. The employee in the plumbing section said metal pipe would be a problem even if I had a moisture separator and he suggested plastic pipe, such as PEX. Willing to read your suggestions. What works and what doesn't?