The TB Woods 4J series is 100% interchangeable with industry-standard Size 4 sleeve coupling flanges

providing the structural integrity required for high-traffic facilities

The "LF" prefix indicates lead-free construction

per gallon of water

Lochinvar & A.O. Smith 100187931 Burner Assembly 319852-301 The TB Woods 4J seriesThe Lochinvar & A. O. Smith 100187931 Burner Assembly is a critical OEM replacement part for natural gas commercial and residential water heaters. This 16 inch burner assembly is precision engineered for specific natural gas (NG) configurations, utilizing a #34 orifice to regulate gas flow and ensure proper combustion within the burner chamber. Maintaining the integrity of the heat exchanger requires a clean, consistent flame pattern, which this