Ireland's Child is bang on.
Let me throw this out to ponder.
If you were to use a non-certified tank as a pressure vessel and it exploded, the damage may not be covered by your home owner's insurance. The same may be true if you remove or never installed a GFI breaker (where required by code) from a circuit and a fire occurred.
The chances of having a claim denied increases exponentially with an insurance policy covering a business.
When you have an insurance claim for a car accident, the insurance company seeks to assign blame to minimize their outlay. However, they usually wind up paying even if you're at fault. If you had non-DOT rated tires on your rod and had an accident, the insurance company could deny your claim. Though, it probably doesn't happen or at least, often.
Aviation insurance is different. If you use a non-certified part or a part that can't be properly traced for history, you have no insurance! It's not a matter of threatening to sue the insurance company. You flatly have no insurance coverage. Your claim will be rejected and you have no recourse.
If not in place now, this position will become a standard for claim denial for other types of insurance. The insurance company will look for any reason to deny your claim and finding a building code violation is what their looking for.