I have almost the exact same "Gast" pump only mine is a called a vacuum pump. I bought it for vacuum clamping on my router. I bought it from
Surplus Center. I also got a filter for it because I heard the pump guts are sensitive to dust, etc. This filter is bigger than it looks, at over 3" diameter. It was about $6. I think it came with the filter, because I don't recall buying the filter.
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