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I had a pump salvaged from an old X-ray processor I'd dismantled a few years ago, and using a bucket and some tubing,
I discovered that, while it was nearly completely silent, it was not self-priming. Once primed, it worked great, with plenty of flow.
But if it wasn't primed, it'd sit there and just hum all day long.

The pump was not submersible, so I had to come up with a way to keep it dry, but also below the fluid level in my reservoir.
So since this was a quick-and-dirty test run, so to speak, I whipped up a sort of "bulkhead" fitting out of 1" aluminum round.





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