Boat rectangular portlight
310 Beckson

Using any of these dimensions will determine which Beckson Newport you have. The overall dimension is the trim ring or frame size. Please make sure to measure the length of the thru-hull portion with the lens closed to the edge of the trim ring. That will tell you how long a spigot you need. The spigot should be flush with the edge of the trim ring. This will maximize the draining action of the frame.

Size : 310

Spigot Dimension
Hole cut size
3-1/2" x 10-3/8"
(8.9 x 26.4 cm)
Lens OD:
3-9/16" x 11"

Outside Frame
Overall Dimension
5-1/2" x 12-3/8"
(14.0 x 31.4 cm)
Screen OD:
2-15/16" x 10-1/4"