Big aluminum check valves?

I have a bunch of check valves, look like 1 1/4 NPT. They are check
valves, opened by low pressure, and are made of aluminum. Would anyone
know what they are called and for sort of application. I looked and
could not find anything similar.
Reply to
Ignoramus16281
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They're called check valves or foot valves, depending upon purpose. Checks are usually inline, with foot valves having only one end threaded. Foot valves are used in well and sump lines for keeping the line primed.
Reply to
Larry Jaques

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