Bomar 900 Series Molded Hatch Square. A 2-Dog Black Hatch has quick action dogs, collect arm and vent position with a Smoke color acrylic lens. There are a few options Sold Separately: Trim ring (GT 966-1 black, GT 966-2 white) and screen (GS 966-18 black, GS 966-28 white).
Hatch Opening: 16 5/16" x 16 5/16" (406mm)
Outside Deck Flange: 18 7/8" x 18 7/8" (480mm)
Outside Lid: 19 1/8" x 19 3/8" (486mm x 492mm)
Cutout: 16 7/8" x 16 7/8" (428mm)
Cutout Radius: 1 11/16" (43mm)
Weight: 7 1/2lbs