Genuine NGK BPR4HS resistor spark plug, also identified by part number 15270144, provides reliable ignition for a wide range of small engines. This standard nickel electrode spark plug features a 14mm thread diameter, 1.25mm thread pitch, and a 12.7mm (1/2 inch) thread reach. It has a 20.8mm (13/16 inch) hex size, a heat range of 4, and a standard gap of 0.7mm (.028 inches). The projected tip and gasket seat type ensure efficient combustion and a secure fit.