Report Mortar types in Ajijic/Chapala/Guadalajara Posted September 3, 2018 Just remember that if using black pipe for gas that you should NOT bury it in concrete. It needs to be used only where it can remain accessible and away from the elements (unless painted to protect from the elements). NEVER EVER use galvanized pipe!! If you need to go through a concrete wall, you must put the black pipe in a plastic sleeve. The preferred material for gas lines these days is reinforced PEX type tubing. I have been able to purchase this along with the special compression fittings from gas supply stores in Guadalajara.