40 Manufacture of precast concrete such as Utility Vaults, Electric Vaults, Interceptors, Communication Vaults, Septic Tanks, Steps, Parking Blocks, Hand Holes, Inlets, Sewer, Manholes, Storm Manholes, Transformer Pads, Retaining Bocks, Drainage Structures, Blocks, Water Troughs, Feed Bowels, Bollards, Splice Vaults, Pullboxes, Infantry Target Emplacements, Wall Panels, and other precast concrete related items to order and/or specification of others