That's just a quarter-turn ball valve with a small handle.
The Dahl kit basically puts a 90-degree bend on the end of the pipe from the wall, so that it doesn't protrude too far into the room, and then puts a nice Dahl quarter-turn valve on the end of that. Reach's photo link shows how it works.
In lieu of the Dahl valve, you could just put a 90 bend on the end and rig your own valve on the end of that. However, the Dahl kit looks nicer and may be easier to attach for a novice.