My husband put a new water supply line in for a toilet in a rental place we have. Now he is out of town and it is leaking a lot. It seems to be leaking from where the metal piece connects the flexible hose to the nut where it tightens down. If I get it positioned just so it just leaks a little, but the slightest movement of the hose makes it leak a lot. Is there a product that can just be put around the top to seal it off? Any help is appreciated!