This product is a 100% brand new, original SEAFLO product. Low profile hatch, designed for installation on internal or external flat surface. Heavy duty, UV stabilized white ABS construction. Reinforced lid with non-skid surface. The lid hinges 180 degrees and completely covers the mounting flange, for an attractive flush finish. Rubber seal ensures weatherproofing when mounted on vertical surfaces. Supplied with 2 strong recessed handles Easy to install, pre-drilled countersunk fastening holes (screws not included).Overall size: 18" x 20" 460 x 510mm | Opening clearance: 15" x 17" 383 x 436mm | Protrusion above deck: 0.7" 17mm | Intrusion below deck: 1" 26 mm | Mounting screws not included