Brass is one of the most common substances used in making Pipe Fittings. Brass as a construction material is an alloy (mostly) of copper and . zinc Brass Fittings are in high demand because of some inherent qualities which make them superior to other materials. Brass fittings are for the conveyance of Water, Hydraulic Fluids, Pneumatic Applications, Flammable Gases, Slurries, Chemicals, etc.