Abstract: A casing spacer comprised of high strength plastic includes two complementary nut and bolt connected members each having an arcuate inner portion adapted for tight-fitting engagement with a pipe's outer surface and plural linear ribs (risers) extending radially outwardly from the arcuate inner portion and adapted to engage an inner surface of an outer casing maintains the pipe in fixed position within the casing. The arcuate inner portion of each member is flexible so that its entire inner surface contacts the pipe's outer surface for a range of pipe diameters, permitting only two members of fixed size to be used with variously sized pipes. Each casing spacer member includes an aperture in its flexible, arcuate inner portion which is disposed between aligned risers and is adapted to receive and retain a non-slip member frictionally engaging the pipe's outer surface for maintaining the casing spacer in fixed position on the pipe.