1950 BB1 serial number 1627 vacuum pump, running, but has a rod knock so needs to go back in the shop before it goes to storage.
This one has a combination muffler / dome cap, its the only BB series pump I've seen with this, I have seen 2 of the green RV pumps with it, but thats out of approx. 1400 surge pumps that have found their way to my shop to be repaired/restored or sadly, sometimes parted-out and scrapped.
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