While the 190°F rating may match

Ensure your secondary heat exchanger is draining properly by utilizing this genuine trap/elbow assembly for all compatibility-matched service applications

moisture accumulation around the trap flange

or soot accumulation caused by incorrect gas-to-air ratios

Compatible with a broad range of 1F90 series and 1F70 series units (excluding Blue models)

Lochinvar & A.O. Smith 100027491 Orifice While the 190°F rating mayThe Lochinvar & A. O. Smith 100027491 Orifice is a high precision gas burner component engineered for specific water heating and pool heater applications. Featuring a 1 2" HEX RH (Right Hand) design, this direct replacement orifice ensures calibrated fuel to air ratios for optimal combustion efficiency. This part serves as the current manufacturer authorized update for the legacy 076243 030 part number, maintaining the exact tolerances required for