On Tue, 10 Dec 2013 07:47:01 -0600, Ignoramus16281
wrote:

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.

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.

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I hate being bipolar ....... It's awesome!