T & H MARINE SUPPLIES HAT13172DP Sure Seal Hatch is the most innovative design ever available in access hatches plates. These hatch plates provide an attractive and economical way to access horizontal or vertical storage areas. Watertight lid overlapping frame. Two separate seals on frame and lid. No visible fasteners. Corrosion-free integrated hinge. Hinges allow 180-degree opening. Non-locking hatch. Outside: 12-3/4 x 17-34 Inside: 9-5/16 x 14-3/16 Cut Out: 10-1/12 x 15-1/8