Help with floor drain backflow

Hello Citizens of Reddit, I am in need of some advice here. I have a corroded floor drain that you see in the picture. This drain in my basement seems to back flow under extremely heavy rain. It has caused some water damage as a result. 1. I would like to prevent water from coming back up, so I bought a back flow preventer and try to replace the drain cover with it. Can any of you folks think of a better solution to this issue? 2. In an effort to try to take off the existing cover, I scraped away some of the flooring to reveal more of the drain cover. This appears to be a cast iron cover that was cemented down. Before I take an angle grinder to the cement surrounding this cover, I would like to see if there are other solutions that could be less destructive. I can foresee the angle grinder solution going very wrong. Any advice would be appreciated! Thanks Reddit!

What is this part on a prier cold stem?

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What is this? #2

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