This Lochinvar component is a gas/air arm, designed to regulate the flow of both gas and air in heating systems. It is constructed with high-quality materials for durability and longevity. The gas/air arm functions by adjusting the mixture of gas and air that is fed into the burner, which directly impacts the efficiency and performance of the heating system. It is compatible with various Lochinvar models, making it a versatile replacement part. The product dimensions are standard, ensuring easy installation in compatible systems.