Garage wall bulkhead/pass-through port

[pope]

I have clean water lines in my garage but no drain (it's complicated/gravity works against me). Even if I did I would rather run fresh coolant water out into the yard to water plants when I'm not running a pump to recirculate. And I'd rather not snake the hose around and out the door like I currently do because of tripping hazards and rats (they like to try and get in at night even when I'm present). So, it's easy enough to drill a hole through the wall but I'm interested in knowing if anyone has done this elegantly or has a creative idea of how to do it.

My first thought is just to epoxy bulkheads and pipe together in the wall so that regular hose will slide straight through, that leaves me corking the opening when it's not in use. Or I could use plumbing hardware and quick disconnects.