White Rogers Natural Gas Valve, For Water Heater #'s 6 30 Yort/S, 6 40 Yort/S, & 6 50 Yort Series, Not For Use On 6 30 Gort/S 200 & 300, 6 40 Gort/S 200 & 300 Or 6 50 Gort 200 & 300 Series Heaters Built Between 2003 & 2008 Only, No Wire Leads On Gas Valve.