Pretty sure I've seen some at western pump here in town so I suspect some hut tub supply type stores may have them. I'm also thinking Lowes has something similar, although pretty sure it didn't have the clear center and possibly only a single union but they were all plastic swing style check valves.
You can also try Red coral and Concept, both not listed on websites but they may have them, pretty sure Dave said he was going to carry check valves.
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