The Montague 2190-3 is a pilot orifice designed for use with natural gas (NAT) in Montague commercial cooking equipment.It has a small orifice size of 0.018 inches and a 1/4-inch connection. The orifice controls the flow of gas to the pilot light, ensuring a stable and properly sized flame for ignition of the main burner. https://partsfe.ca/pilot-orifice-nat018-for-montague-part-2190-3