the regen valve is in the engine bay and meters manifold vacuum to the system, the purge valve is actually on the charcoal canister and closes off to make the system air tight.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)