Turbo or charge air intercooler connector.
This little bugger has an $87.19 list price.
See photos with tape measure for dimensions
Used on Cat 3126 and 3116 and others
Chevrolet T6500 1997 1998 1999 2000 2001 2002
Chevrolet T7500 1997 1998 1999 2000 2001 2002
GMC C6500 1999 2000 2001 2002
GMC C7500 1999 2000 2001 2002
GMC School bus 1999 2000 2001 2002
Isuzu tilt cab is the T series.
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