particular embodiment shown in fig1 20 fig2 23 depict yet another embodiment of the present invention comprising a cap 4 a main body portion 6 and a corner feature 100 disposed generally in a corner of the main body portion 6 the corner feature 100 comprises an extruded or extended portion of the main body portion 6 and at least one female threaded aperture 102 for receiving at least one fastener fig2 is a top perspective view fig2 is a bottom perspective view and fig2 is a detailed top perspective view in various embodiments a corner feature 100 of the present invention comprises a threaded female member 102 within which a fastener may be placed in certain embodiments particularly those where the corner feature 100 is comprised of a concrete material the corner feature 100 comprises an aperture 102 within which a threaded insert or sleeve may be provided in one particular embodiment the corner feature 100 comprises a mass of concrete that provides structural support or a region within which a threaded sleeve may be inserted the threaded sleeve adapted to receive a fastener for securing a lid thus in various embodiments a main body portion may be formed with a protrusion or extension of concrete capable of withstanding various loads such as loads provided by the application of force to the threaded sleeve via a fastener and connected lid while fig1 23 generally depict a subgrade vault 2 comprising a corner feature 100 for securing one or more fasteners it will be expressly recognized that the present invention is not limited to an extrusion or extension disposed in a corner of the vault 2 indeed it is contemplated that such features or extensions may be provided at a variety of locations including.