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Wavin PP-RCT with a Basalt Fiber layer is a new generation of polypropylene pipe that is redefining hot and cold-water pressure piping distribution systems. Wavin PP-RCT with Basalt Fiber has superior properties for residential and commercial HVAC applications. The unique 3-layer pipe has a middle layer containing basalt fibers, derived from a volcanic material that limits linear thermal expansion changes due to varying temperatures. It weighs less than metal pipes and is much more environmentally friendly than the more commonly used man-made glass fiber layer in PP-RCT offerings.