7.3L Powerstroke ICP/EBP Plug with pigtail.
Also called ICP Plug or EBP Plug, or exhaust backpressure valve plug.
The stock plug gets brittle after several heat cycles and the hold-down clip tends to break off, compromising the connection quality.
This high quality International plug includes about 6 inches of wire pigtails so you can cut the original plug off and wire the new one in.
Cross references to Ford part number 5C3Z12224A, Alliant Power part number AP0021