This is a BRAND NEW Universal Robertshaw furnace Gas Valve. The valve comes with an LP conversion kit, and several fittings you may or may not need for installation. The Robertshaw # is 720-054 and it is designed to replace Lennox/Armstrong/Ducane part #s 36449B3 36449B4 & 2066101. The valve has a 1/2" inlet, and 1/2" outlets on the front and back (comes with caps to cap these off) and a 3/4" outlet opposite the inlet side (valve comes with a reducer to make this 3/4" a 1/2" outlet if desired). Thanks for looking and good luck!
The gas valve is a low voltage control (usually 24 VAC) that allow gas into the combustion chamber. It is also an adjustable regulator that insures proper gas pressure for combustion. They have a manual shut off.