SUPPLY GIANT Expansion PEX Pipe provides superior durability, corrosion resistance and flexibility for the most demanding environments. Expansion PEX is available in red, white and blue for the simple identification of cold water, hot water and main water lines. The Apollo Expansion PEX system is a comprehensive cold expansion piping system comprised of brass fittings, poly alloy fittings, manifolds, valves, fasteners, tools and tubing designed for implementation in water delivery systems, simple or complex.