This is cast aluminum. Sturdy with reasonable spring force - closes securely but doesn't require gorilla strength to open. UL listed. Wrong seal but for flush installation. Instead of cutouts for a duplex outlet, the slots in the foam padding are for the back of a non-supplied electrical box. You CAN make cutouts for the outlet, but I decided to make my own out of 1/16" thick sheet of butyl rubber. See photo.
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