The McCormick 6694561A1 is a genuine OEM spark plug, cross-referenced to NGK BPR6ES, designed for optimal engine performance in McCormick X10.25, X10.30, X10.35, X10.40 tractors. This high-quality spark plug features an M14x1.25 thread with a 19mm reach and a 20.8mm hex size. It is also compatible with Landini Mistral 40, 45, 50, 55, and Valpadana 4545, 4550, 4555 models. It replaces OEM part numbers such as Landini 3671291M1, Massey Ferguson 3671291M1, and Perkins 2872365M1.