vacuum canister. I see them a lot on gas engines that don't have the coffee can vacuum canister. Its purpose is to hold extra vacuum for what ever accessory needs to use it. ( brake booster, cruise control, HVAC controls)
It's a vacuum reservoir. Stores up vacuum so you can run a smaller vacuum pump. That looks like a later one. On these trucks you need vacuum for heater controls, brakes and cruise. I don't think there's anything else. Think about like a tank for an air compressor. Same principle.
I'm working on replacing my missing coffee can with a 1 lb propane cylinder. Empty of course. I'll make a thread if it works when the last of the fittings arrive.
You must have a check valve in there. I got a brass one, but the spring may be too strong. If that's the case I'll dump it and use a plastic automotive check valve that plumbs into the vacuum line (didn't think of that until after I ordered the brass one).
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