Re: brand new nammor hose is... RUSTING!
You need to post a picture. Nammor hoses have no metal in them. If your hose has metal in it then it is not a nammor. Can you like to the exact product you ordered?
Also, where was the rust exactly? Was it on the end of the hose or inside it? If the actual tip had rust on it i would suspect that your hose port was rusting.