MB-16 Polyethylene Water Meter Box Approximate Measurements 15" x 10" x 12" and tapers to 19 1/2" x 14" x 12" The new MB-16 water meter box is designed for a 5/8" to 3/4" meter set. It was developed as a replacement for the heavier concrete 36 boxes on the market today. The MB16 is versatile and strong. The standard depth of this box is twelve inches and can be either ordered with or without the bottom setting ring. The box accommodates a standard 10"x15" lid.