Here is a very cool vintage piece of electronics! I don't know much about this, but I'm pretty sure it is a vintage Klystron Microwave Amplifier Tube. This was bought with alot of other vintage electronics and quite a few pieces look like they were old military items of some kind.
Dwyer Instruments Slack Tube Manometer Made In The USA! Dwyer slack tube manometers are as accurate as the finest laboratory gages, yet they are made to roll up compactly for easy carrying and to withstand rough usage. Simply unroll the manometer and set up to read static pressure, vacuum, or differential pressure.
This is a lot of NINE tubing connectors with compression fittings. The OD of the tube needs to be around 5/8" as you can see in the picture with the ruler. The center and the two compression rings appear to be stainless and the two end nuts are made of a non magnetic.
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