The top has a recess for the included gasket, a few drops of glue will be needed to hold the gasket in. The main opening for feeding the cables has a sliding gasket/hole cover that will fit around any size wire you feed in.

There are also recesses in the lid and body for standard 6mm magnets to assist in holding the lid shut, I have had this for several months during SEVERE storms and the lid has never moved or come off.

I recommend printing in either PETG or ASA/ABS to ensure weather/UV resistance