MTD E3.22 Spark Plug, 0.551 in Thread, 6

14 mm thread Dia, 3/4 in reach, 13/16 in hex socket. Saves on fuel and Reduces emissions. Replaces Champion N9YC, N11YC, N12YC. RN9YC, RN11YC, RN12YC. Replaces NGK B6EB11, BP5EA, BP5ES, BP5ES11, BP5EV, BP5EY, BP6ES, BP6EV, BP6EY, BPR5ES, BPR5ES11, BPR5EV, BPR5EY, BPR6ES, BPR6EV, BPR6EY, BPR7EY11, BPR6EBL11, BU8ET, BUR6EA11, BUR6EB11, GR4, GR45. Replaces Autolite 63, 64, 65, 66, 405, 646, 4263, 4265, AP63, AP64, AP66, AP646, APP64, APP646, XP63, XP64, XP646. XST4265.