The A & I PRODUCTS 839071M1 block plug heater is designed for efficient engine warming in cold conditions. Constructed from high-quality materials, it ensures durability and reliable performance. This heater is compatible with various engine types, providing quick and effective heating to enhance starting performance. It meets industry standards for safety and efficiency.The block plug heater 839071M1 from A & I PRODUCTS is an engine heating component designed to warm engine blocks for easier starting in cold conditions. It features a metal heating element encased in a corrosion-resistant plug housing that fits standard engine block openings. Operating on 120V AC, it provides controlled heat output to maintain engine temperature above freezing. The heater complies with electrical safety standards and includes insulated wiring and connectors for secure installation. Suitable for use in automotive and small engine applications, the A & I PRODUCTS 839071M1 block plug heater supports cold-weather engine performance.