Jim Black Escape Hatch 18.5" x 18.5"

UV Stable Plastic Resin
Chemical Resistant
2" Hollow Core Seal with .500 Crush for Water Resistant Product
1/4" Temper Glass for Strength, Clarity, and Chemical Resistance
Matching Trim Ring.
External Handles for Emergency Escape.
Outside Dimensions : 21" x 21".
Inside Dimensions : 17.75" x 17.75".
Cutout Dimensions : 18.5" x 18.5".