Specification - MI-VB, MI-VB-SM - Valve Box Material - MI-VB Series is 14 gauge satincoat steel door and 16 gauge satincoat steel box and frame. The MI-VB-SM Series is 16 gauge satincoat steel door, box and frame. The MI-VB-SS and MI-VB-SM-SS stainless steel Series are 16 gauge #304 stainless steel door, box and frame. Finish - Satincoat steel boxes have a primed white finish. Stainless steel boxes have a #4 brush satin finish. Door - MI-VB Series - flush to frame. Turned back around edges for extra rigidity. MI-VB-SM Series - overlaps box, providing a tight secure fit. Optional - opening cut out of door to allow for glass or plastic window to be installed - window material supplied by others. Frame - MI-VB Series - pre-punched mounting holes for simple installation. It is welded to the box. Box - MI-VB Series - welded onto the frame. MI-VB-SM Series - hinged to the door. All boxes are closed. They have a steel back to them. Optional - knockout holes for piping. Hinge - Concealed pivot pins. Latch - Standard - flush mounted, screwdriver operated cam. Optional - Allen key, cylinder key, flush paddle latch, or pull ring catch. ll of MIFAB's cylinder key locks are keyed alike. Packaging - One box per carton.