Beckson HT1821AW Rectangular Flush Hatch, 18-1/8" x 20-1/2", White

Hatches are easy to install, and mount vertically or horizontally (invisible fasteners when cover is closed). 180° opening, weather tight seal, reinforced with textured non-skid surface. UV resistant. 1/2" Closed height. AW Models: ASA Material - Acrylonitrile Styrene Acrylate