Robertshaw 10-066 Orifice

The Robertshaw 10-066 Natural Gas .018 Orifice is a critical precision-engineered component for maintaining stable pilot flame characteristics in high-demand heating applications. Specifically designed for use with the Robertshaw 1890 series and 1898 series pilot burners, this orifice ensures a consistent gas flow rate required for reliable thermocouple or thermopile immersion. Featuring a .018-inch aperture, it is calibrated for natural gas systems, providing the exact BTU output necessary to avoid nuisance dropouts and ensure rapid ignition of the main burner. This pilot orifice replacement is compatible with 3/16-inch tubing and is frequently utilized in commercial cooking equipment and residential furnaces where a #70 or #71 pilot setup is specified. For technicians performing HVAC burner maintenance, using an OEM Robertshaw orifice is essential to meet manufacturer specifications and maintain the integrity of the pilot assembly without the risks associated with improper manual reaming or universal sizing.

• Precise Gas Metering: The .018 orifice size is factory-drilled to provide a consistent pilot flame, preventing carbon buildup and flame lifting.
• Series Specific Compatibility: Engineered specifically for Robertshaw 1890 and 1898 gas pilots, ensuring a perfect mechanical fit and proper venturi effect.
• Durable Brass Construction: Manufactured from high-grade brass to resist corrosion and withstand the high ambient temperatures of a gas burner combustion chamber.
• Universal Application Support: While series-specific, its 3/16-inch tube connection makes it a standard choice for a wide variety of commercial cooking accessory repairs.

• Can I use this orifice for Liquid Propane (LP) conversions? No, the 10-066 is calibrated specifically for Natural Gas. LP applications typically require a smaller orifice (often around .011") due to the higher energy density of the fuel.
• Is this compatible with 1/4-inch pilot tubing? This part is designed for 3/16-inch tubing. Using it with 1/4-inch lines would require the appropriate compression adapter to ensure a leak-free seal.
• How do I know if my orifice needs replacement? If the pilot flame is too small to stay lit under load or if it shows a "lazy" yellow flame despite proper air adjustment, the internal flow path of the orifice may be obstructed or worn.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.