Canterbury Blue Flame NKY.18 18 in. Universal Gas Valve Key - Polished Chrome This key comes in a polished chrome finish. The blue flame gas Valve Key will fit a 0.25&#34; and a 0.3125&#34; gas valve stem. The 18&#34; size key comes in 2 colors to choose from chrome and brass. Assembled Depth: 0.75&#34;. Assembled Height: 18&#34;.