Modine 5H0547510021 Orifice R-407C The 318827 O-ring is specifically

The 318827 O-ring is specifically engineered to withstand the thermal cycling and chemical treatments found in commercial and residential steam boiler systems

Enhanced System Reliability: Durable diaphragm and terminal construction reduce electrical resistance and prevent false system lockouts

the main valve diaphragm is the first part to inspect for pinholes or deformation

This assembly is designed for specific furnace chassis

Environmental Protection: TEAO enclosure prevents dust and moisture ingress

Modine 5H0547510021 Orifice R-407C The 318827 O-ring is specificallyThe 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