[Replacement]Spark plug replacement for 7131/BPR6ES, for 7995/WR6DC 7900/WR7DC, for RN9YC RN10YC RN11YC, for 3047/W20EPR-U/VW20, for MTD 951-10292 751-10292 Engine 131-039 and so on. [Size]Spark The diameter of the plug thread is 14mm (0.55"), the thread length is 19mm (0.75"), the hex size is 21mm (0.82"), the gap size is 0.9mm (0.035"). Please check your model and size before ordering to ensure it is the correct part. [Durable Enough]The exterior insulation is made of high-quality alumina silicate ceramic, treated with corrosion-resistant plating for a longer service life. [Better Stability]The pure copper core could increase heat transfer and dissipation, easily achieve reliable starting, and prevent the risk of overheating. [Quality Guarantee]Our spark plug is designed, engineered, and tested to exacting standards. For anything that you are not satisfied with, we will offer you a 100% refund.