Arnold E3.22 Spark Plug, 13/16 in Fill Gap, 0.551 in Thread, 13/16 in Hex

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.