Weil McLain 560-528-997 Burner Orifice

The Weil McLain 560-528-997 Burner Orifice is a high-precision natural gas burner orifice engineered for exact fuel metering in residential and light commercial cast iron boilers. This OEM Weil McLain replacement part features a 2.0mm drill size and is machined from high-grade brass to withstand the thermal stresses of continuous combustion. It is compatible with Weil McLain CG, CGA, and CGi boilers, ensuring a stoichiometric air-fuel ratio that maintains peak BTU output and steady-state efficiency. With a 1/8" NPT thread and a 7/16" hex head, this component allows for secure torque and leak-free installation on the burner manifold. For technicians troubleshooting intermittent pilot or standing pilot systems, replacing a clogged or oxidized orifice with this genuine 560-528-997 assembly restores factory-spec flame patterns and prevents carbon buildup. Using original equipment ensures the gas delivery system remains calibrated to the heat exchanger’s design capacity, preventing dangerous over-firing or inefficient operation.

• Precision Metering: Factory-drilled 2.0mm aperture ensures consistent manifold pressure and optimal burner performance.
• Direct OEM Fit: Drop-in replacement for the Weil McLain 560-528-997, eliminating the need for field modifications.
• Industrial Build: Corrosion-resistant brass construction handles high operating temperatures without deformation.
• Boiler Compatibility: Verified for use across the CG, CGa, and CGi series gas-fired boilers.

Is this orifice compatible with Propane (LP) systems?
No, the 560-528-997 is specifically sized at 2.0mm for natural gas flow rates. For liquid propane applications, you must use the correctly sized LP orifice (typically part 560-528-998) to prevent hazardous combustion conditions.

What are the physical dimensions for manifold fitment?
This part features a standard 1/8" NPT male thread and a 7/16" hex for easy installation with a standard nut driver or socket.

Can I clean my old orifice instead of replacing it?
While cleaning is possible, any scratching or enlargement of the 2.0mm bore during maintenance will alter the gas flow. Replacing with a new Weil McLain burner orifice is the only way to ensure the boiler fires at its rated efficiency.

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.