The S1-9951-1691 is a gas orifice that has a 1/2" hex head size, 3/8" length, and 7/16-27" UNS threads. It has a #18 (0.1695") drill size suitable for furnace applications.
What is a gas orifice?
The gas orifice's function is to dispense fuel into the burner tube through the small precision hole to provide the appropriate supply of flame.
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