The Ratioparts 1813 spark plug is a high-quality replacement component designed for various small engines. Featuring an M14x1.25 thread, a 9.5 mm thread length, and a 20.8 mm hex size, it ensures reliable ignition. With an electrode distance of 0.75 mm, this spark plug provides consistent performance. It is a direct equivalent to popular OEM and aftermarket spark plugs, including NGK B2LM, Champion J19LM, Bosch W9EO, and several Briggs & Stratton part numbers, making it a versatile choice for maintenance and repair.