@leyonhjelm @triodug @coolboymew @moth_ball I always drill a 1/8" hole in the bottom of handi-boxes like that. They fill with water if you don't. Sometimes I do multiple holes since some have multiple low spots that need to drain inside. Even if you try sealing the gasket with sealant they will fill with condensation so the holes are the answer with boxes like that. At least in my climate.