Stay Warm, Stay Ahead! ❄️ Engineered for durability, ensuring long-term performance. Quick and easy installation for instant warmth. Designed for both home and professional use. Efficient propane use for a greener footprint. Seamlessly fits Mr Heater MH9B and MH9BX models. High heat output Easy installation Durable design The F273401 73404 Pilot Assembly is a high-performance component designed for compatibility with Mr Heater MH9B and MH9BX models, ensuring efficient and reliable heating for both personal and professional environments. With easy installation and a durable design, this pilot assembly is the perfect upgrade for your portable propane heater.