Italian four-door jokes aside, this four-port air line splitter from DeWalt looks pretty durable. Besides a nice big carry handle (which, incidentally, seems well-placed to protect the regulator adjustment knob), it also features a liquid-filled gauge to help you dial in the perfect pressure. And it’s factory leak-tested — unlike the last monstrosity you made out of a bunch of Harbor Freight fittings and PTFE tape.
The plastic housing includes hang holes, which makes slapping it on a 2×4 at the jobsite a bite easier, too.
One drawback: $45 seems like a lot of cash for four splitters and a regulator, though it is well under my “spend now so you don’t have to spend later” limit.