This assembly consists of a precast concrete base with a 44-inch height and 22-inch by 26-inch interior dimensions, featuring typical knockouts with a 2-inch minimum wall thickness. The base is reinforced with number 3 bars at each corner, each side, and each way. A 12-inch riser section sits atop the base, reinforced with two number 3 bar hoops. The top adjustment section is 6 inches high and reinforced with one number 3 bar per hoop. Rectangular adjustment risers are available in 2-inch, 4-inch, 6-inch, 12-inch, or 24-inch heights.
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