That’s awesome! They’ve been so convenient to use. I just recently tried out these as well, and they’ve been nice for cleaning ash catchers. Rather than soaking them in a bag of iso and salt, I filled the ash catcher, used the plugs on either end and just shook it.

I could be wrong, but I don’t think the 25-year import rule in the US has anything to do with what side drive the car is. It was a law passed in the 80s to shut down gray market imported cars. Importers would buy cars from countries where they sold for much cheaper than the US and then resell them for way less than official dealerships.

The law would’ve been targeting left-hand-drive vehicles, so the right-hand-drive stuff is just a byproduct of it. I mean, the US government had all of its postal service trucks built to be right hand drive.

To add on to the OP, if you’re cleaning any kind of bong or bigger bubbler, these are great. You fill the piece up with a good amount of salt and 91%+ isopropyl alcohol, use the caps to seal it and shake the shit out of it. Prior to ordering a few packs of those, I had always just taken some saran wrap, layered it a few times over the openings and rubber banded it in place to avoid any leaks when shaking.