CX-5 Turbo water pump leak?

Mazda cap was $30+. I replaced mine (at the 11 year old mark) with this Sankei KH-C17 cap. much more affordable.

 
I still have my original cap on, I just bought one for when I swap out the antifreeze sometime in the following weeks. You gotta ask what the difference is between the Mazda and say a Stant which is about half the price. Anyone know what the new rev was all about?
 
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