Accommodates a 2 ½" (6.4 cm) fire dept valve with cap, chain and a portable fire extinguisher on shelf above the valve. Regularly furnished: 20 ga. box, 20 ga. tubluar steel door with 18 ga. frame and a continuous steel hinge (brass pin). Recessed, semi-recessed and surface mounted cabinets are furnished with 0.125" (0.31 cm) radiused frame. Wall mounting: surface. Inside box dimensions: KxLxM: 16 x 42 x 9¼ inches.