Yes, the box is 100% sealed and even the wires are grommeted tightly to the box. There is a hole drilled in the floor so the box is vented to outside of the car and that's grommeted as well. Everything is included for that part if you buy just the box. As far as I know, that's the only plastic box certified usable for nhra, otherwise you need a firewall of some kind. It passes all the requirements, and even has metal tie downs mounted inside. I will also add it takes a lot of steps to actually get the battery out of the box.
