The Trojan® #58 Orifice - Main Burner (LP Only) (#14428A) is a precision-engineered component designed exclusively for the Trojan 66B Stock Tank Heater. This orifice regulates the flow of liquid propane (LP) gas to the main burner, ensuring optimal combustion and efficient heating performance. Manufactured to exact specifications, it maintains the heater's reliability and safety in livestock watering applications.