MB-10 Polyethylene Water Meter Box Approximate Measurements 17 1/4" x 12 3/4" x 12" Proven Service The exceptionally formulated material used in the New MB-10 meter boxes have been tested and proven in service by water and gas industries. The New MB-10 meter box has all the same characteristics as the MB-1 but with a depth of 12" this box was engineered for communities with a shallow frost line or sandy areas. The New MB-10 allows a variety of substantial applications. The superiority of the New MB-10, which is 5/8 " thick pure polyethylene, meter box offers industry a tremendous economy through longer life.iority of the MB-1 meter box offers industry a tremendous economy through longer life. Proven Processing Our structural foam molding process allows our parts to have a cellular foamed core surrounded by integral skins. The process gives our products high strength-to-weight ratio making it have greater rigidity than solid parts of the same material and of equal weight. Item # 3