Product Description: A "roller-bearing" pipe support used to support roof-mounted gas pipes, electrical conduit, solar piping and other mechanical piping. Unique design absorbs thermal expansion and contraction of pipes thus preventing damage to the roof membrane. Pipes rest on a self-lubricating roller which is made of a stainless steel rod and a polycarbonate resin roller. The pipe support base is made of hot-dip galvanized steel and all other metal parts are made of stainless steel. Pipestand will accommodate up to 4" pipe (inside diameter) or up to 5" (outside diameter) pipes.