Bought off Wal-Mart no name on cover just a tag on cover did I get screwed is t

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This is definitely a Yong Heng. "Knock offs" always have some difference in appearance but this has NONE. Your Yong Heng has got a spec plate but not the printed name on the case. I believe that's because it's intended for foreign markets. My Yong Heng is purchased directly from Yong Heng in China, it has got no spec plate but a big printed name.

I bet your Yong Heng came with a very detailed manual. You don't expect that for a knock off. Mine came with a much simpler manual in Chinese. In case you haven't got it, a member has posted the manual here : https://www.airgunnation.com/topic/yong-heng-max-temperature/

As you can see from the photo inside the manual. The compressor has got a spec plate : 

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