Can confirm VaporousDogma's insight. Thank you V!

I would add it seems you have to line up the cap fairly accurately with little margin for error or else it wont cover the o-rings. There's notches inside the cap and two of them come close to the mesh. I wind up looking inside the cap each time before putting it on to line it up. I'd prefer one easier to close the cap, but otherwise it works well. After trying this one, I can tell pretty much anything that'll take VandyVape mesh wire will likely work.