No matter which method or hardware you use for a temporary fix, JB Weld is some good insurance against leakage and another break at the repair site. It comes in types for water, plastic, and steel (metal) applications and when applied properly and given a little time to cure it will form a seal. I would use the water version, but any of the 3 will do just fine. Make a small "worm" with the material after mixing it with the activator by rolling it between the palms of your hands (wear gloves). Then encircle the new nipple/connection with the "worm" and press it in tightly around the fitting. It hardens quickly, but I would wait a couple of hours at least before connecting the hose and filling the tank.