Egg crate

masterswimmer

www.saltwatercritters.com
Manhattan Reefs
Rating - 99.5%
442   2   0
Location
NY
It can be found in two different places in HD. Some stores have it in the lighting section. Other stores have it in the tile/flooring section where they keep the drop ceiling tiles. Either way Wingo is correct, it is light diffuser.

swimmer
 
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