Made of tough ABS plastic to prevent corrosion and discoloration. Vents accommodate the capacity of two 3" (76mm) hoses. 14"L (356mm) x 5-3/4"H (146mm) x 1"D (25mm) with 1/2" flush height. Cut out is 12-1/4" (311mm) by 3-3/4" (95mm). Bulk packaging.