Provides convenient passage for specimen from patient area to laboratory. Mounts in walls 75-145 mm (3″ to 5 3/4″) thick. Type 304 stainless steel, satin finish. Self-closing doors. Interlocking mechanism prevents both doors from being open at the same time; provides sight barrier. Removable stainless steel tray. Rough Wall Opening: 290 x 275 mm (11 1/2″ W, 10 7/8″ H); 3″ to 75-145 mm (5 3/4″) thick.