Provides convenient passage for specimen from patient area to laboratory. Mounts in walls 3" to 5 3⁄4" (75–145mm) 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: 11 1⁄2" W, 10 7⁄8" H (290 x 275mm); 3" to 5 3⁄4" (75–145mm) thick.