Weil McLain 560-528-980 Pilot Orifice

The Weil McLain 560-528-980 Pilot Orifice is a precision-engineered OEM replacement part specifically calibrated for natural gas (NG) applications. Featuring a precise .018" diameter aperture, this component is critical for maintaining the specific gas-to-air ratio required for stable pilot flame ignition in Weil McLain EG boilers and CG series units. A fouled or incorrect orifice can lead to weak pilot signals, frequent nuisance lockouts, or delayed ignition, making the 560-528-980 essential for routine burner manifold maintenance. Built from durable, industrial-grade materials, this natural gas pilot orifice ensures consistent flow regulation to the pilot burner assembly, supporting the overall combustion efficiency and safety of the hydronic system. When troubleshooting Weil McLain boiler parts, verifying the orifice size is a mandatory step for contractors to ensure compliance with the original manufacturer's firing rate specifications. This genuine part provides the exact tolerance needed for professional-grade service and reliable cold-weather performance.

• Precise .018" Orifice: Machined to exact tolerances to ensure a stable, consistent pilot flame for reliable ignition.
• OEM Compatibility: Specifically designed for Weil McLain natural gas equipment, including EG-series boilers and standing pilot systems.
• Optimized Combustion: Helps maintain proper gas flow, preventing carbon buildup and reducing the risk of pilot burner failure.
• Industrial Construction: Resists the corrosive effects of constant heat and gas exposure for long-term field reliability.

Is this orifice compatible with Propane (LP) systems?
No, the 560-528-980 is exclusively for natural gas (NG). Using a .018" orifice for propane will result in over-firing and a dangerous pilot flame; propane systems typically require the smaller .010" orifice (part 560-528-985).

When should the pilot orifice be replaced?
Technicians should replace the orifice if the pilot light appears lazy or yellow, or if repeated cleaning of the existing component does not restore a crisp blue flame and a strong millivolt signal.

Does this fit all Weil McLain boilers?
This part is widely used in residential and commercial models like the EG series and CG series (Series 4-12) with standing pilots. Always verify the part number against your specific unit's rating plate or manual before installation.

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.