Weil McLain 560-528-998 Orifice

For service technicians maintaining Weil-McLain hydronic systems, the Weil-McLain 560-528-998 LP Gas Orifice is a critical component for ensuring precise stoichiometric combustion in propane-fired applications. This OEM LP gas orifice is engineered with a high-tolerance 1.3mm drill size, providing the exact fuel-to-air ratio required for consistent boiler gas burner performance. Designed for durability in high-demand environments, it features a standard 7/16-inch hex head for reliable torque during installation and 1/8-inch NPT threading to ensure a leak-free manifold connection. This specific orifice is frequently utilized in Weil-McLain CGa and CG boiler series, where maintaining the correct manifold pressure and flow rate is non-negotiable for system efficiency. As a veteran contractor knows, using precision-drilled boiler replacement parts instead of generic alternatives prevents common issues like back-burning, soot accumulation, and irregular flame patterns. When converting or servicing propane units, this component is essential for achieving the thermal output specified on the appliance rating plate without compromising the combustion profile.

• Precision Metering: The 1.3mm drill configuration ensures a calibrated flow rate for optimal propane gas combustion.
• OEM Compatibility: Specifically designed for direct fitment in Weil-McLain CGa and CG series gas-fired boilers.
• Durable Construction: High-quality brass material withstands the thermal stresses of continuous HVAC burner operation.
• Standardized Fit: 1/8-inch NPT threads and 7/16-inch hex sizing allow for straightforward replacement with standard technician tools.

Is this orifice compatible with natural gas systems?
No, this part is specifically sized for LP (Propane). Natural gas requires a larger orifice (typically 2.0mm for this series) due to its lower BTU content per cubic foot.

Can I drill out an old orifice to match this 1.3mm specification?
While field-modifying orifices is technically possible, using a factory-drilled Weil-McLain 560-528-998 is the professional standard to ensure the precision required for modern, high-efficiency burners.

What symptoms indicate a clogged or incorrect gas orifice?
Common signs include uneven flame heights, yellow tipping (incomplete combustion), or the boiler failing to reach full thermal capacity due to restricted fuel flow.

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.