Re: What is this?
Yeah - there's typically a one-way valve on the connection closest to the vacuum source (engine)... Vacuum accumulators even-out weak or highly variable vacuum signals (common use includes cruise controls and HVAC air doors).
__________________
'01 XLT Ext Cab 4-dr / 4.0 / 5R55e / 265-75x16 / K&N FPIK / & many unknowns
|