Three different sizes of spark plug. The leftmost plug and center plug are identical in threading and electrodes and may be used interchangeably; the center plug is, however, a compact variant, with smaller hex and porcelain portions outside the head, to be used where space is limited. The rightmost plug has a longer threaded portion, to be used in a thicker head.
* 00:06, 25 November 2005 [[:en:User:Gzuckier|Gzuckier]] 480×358 (25,320 bytes) <span class="comment">(Taken and uploaded by Gerald Zuckier {{GFDL}})</span>
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{{Information| |Description=Three different sizes of spark plug. The leftmost plug and center plug are identical in threading and electrodes and may be used interchangeably; the center plug is, however, a compact variant, with smaller hex and porcelain po