Experience superior performance and increased durability with the RedMax 521233501 CMR6H Spark Plug. Designed specifically for use with RedMax engines, this high-quality spark plug (part number 521233501) delivers a reliable spark and optimal fuel combustion for maximum engine efficiency. Say hello to smoother starts and improved engine performance with the RedMax 521233501 CMR6H Spark Plug. Trust in the brand that professionals and homeowners alike turn to for their outdoor power equipment needs. Upgrade your RedMax engine with this top-of-the-line spark plug and take your equipment to the next level.