Failure or success with Jeg's or Summit branded ( china ) parts

I have had success with their AN fittings for a couple of complete fuel systems from the tank to the carb. Never a single issue.
I do believe they use Earl's for the fittings.

Just like anyplace like Costco, groceries items, wine .... There are retailers that sell a product that has their name on it that they had a company make for them. The retailer amy even sell the manufacturers product right next to the private label product.

Here's a short article with a deeper look into how it works and if you are getting the same quality.
What Is Private Label?: White Label vs. Private Label

My wife used to be a Retail Buyer. She worked for a very well known business where she did this. Sometimes she would reach out to companies to make a product with her label/logo. She would also buy name brand product for retail. For example, wine. She had a well known winery put her label on their bottle. Thy also sold that winery's own branded bottle. It is often that you get the same product.