Seal. Charge Air Cooler. InterCooler.
A component which prevents a leak at the InterCooler.

Intercooler SealTurbocharger Intercooler Seal

Fits Ranger

Intercooler - Repair or Replace
If your 2001 Ford Ranger is equipped with a turbo and you've noticed a reduction in acceleration or a hissing on acceleration accompanying your check engine light, your intercooler or its piping/tubes may need to be repaired or replaced.