I spoke with the plumbing inspector about my final inspections for my new house.
He informed me that I would need a dual check valve installed between the storage tank and the well head. He would not accept the fact that the submersible pump has a check valve on it.
My question is, will installing this valve have any adverse effects on how this pump/system performs/operates.

I have included a few photos to show where I plan to install the valve.
Thank you in advance.

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