The Ford F81Z-9E436-AA is the O-ring that seals the turbo compressor housing to the Y-pipe on a 1999.5–2003 7.3 Powerstroke. It is the seal only. The Y-pipe is not included.

This ring sits in the groove where the Y-pipe bolts to the compressor outlet. A flat or cut ring leaks boost right at the turbo, which shows up as oil film on the housing and a truck that will not hold boost. It is about 3 inches and matches the factory groove. Replace it any time the Y-pipe or the compressor housing comes off. A reused ring rarely seals the second time.

It fits late-1999.5 through 2003 Super Duty 7.3 trucks. Early 1999 trucks use a different turbo outlet.

Fitment

• 1999.5–2003 Ford 7.3L Powerstroke
• F-250, F-350, F-450, and F-550
• Turbo compressor housing to Y-pipe
• Genuine Ford F81Z-9E436-AA
• O-ring only
• Does not fit early 1999

It is not the pedestal O-ring and not the intercooler boot. If the leak is at the boots, this ring will not fix it.