JR Products Black 5-7/8"RO Lockable Multi-Purpose Hatch Access Door L8D83-A 11-0066

4-3/4 Inch Height x 5-7/8 Inch Width Cutout Dimension, 6-1/2 Inch Height x 7-5/8 Inch Width x 7/16 Inch Collar Depth. It accepts 4 Inch rigid PVC or flexible hose & comes with thumb lock for added security.