This is a “Jones Stephens J40-005 Four Way Key, by Honeywell. Nice little gadget to have. It’s made of plated steel, and can be used to open valves, faucets and sillcocks sized at 1/4″, 9/32″, 5/16″ and 11/32”. Weighs in at about 3.4 ounces. Not too much to be adding to your GHB.
Imagine if you were granted permission to get water from a property owner, but they didn’t have a valve or key…everybody wins.