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Shadow boxes are perfect for installations where there is a gap between the walk-in wall and the back of a wall mounted drip tray. A shadow box creates an extruded "pocket" in the walk-in wall containing the beer shanks and the beer hose connections. You would utilize a shadow box to transfer cold air around the shanks instead of the beer heating up in uninsulated wall space. Shadow Boxes are made of 18 ga. Galvanized Steel.