Isometric view of Concast's Pull Box Extension

Pull Box Extension Rings

The heavy traffic extensions are designed to be stacked on Concast's line of pedestrian rated & heavy traffic rated pull boxes; thereby affording more height options.  If using an extension, the cover intended for the base unit will now be used on the extension.  These extensions come in a variety of heights that progress in 1 inch increments.  Example: a 12" tall extension for a 38" x 38" pull box is part number PBEX-38-38-12