Modine 5H0547510021 Orifice 318172-701 You should match the 667294R

You should match the 667294R part number against your unit's parts list

Absoluteley

Negative Pressure Optimized: Specifically recommended for appliances where the vent system normally maintains negative pressure

the internal contacts have failed or the switch has not yet cooled to its 120°F reset point

consolidating your inventory for multiple service calls

Modine 5H0547510021 Orifice 318172-701 You should match the 667294RThe Modine 5H0547510021 Orifice is a precision engineered Natural Gas Main Orifice designed for consistent gas flow regulation in commercial and industrial Modine heating units. As a critical component in the burner manifold assembly, this orifice is calibrated to maintain the specific manifold pressure required for efficient combustion and clean flame characteristics. Built from high grade, corrosion resistant brass, it ensures long term reliability