Water pump hose connectors

Got a good Rigid brand 12 inch pipe wrench ? A pipe wrench proper placed makes a 3 point contact which is less likely to distort a fitting. In this case you would want to get only 2 points ( shallow bite ). Crush the fitting to remove and replace. I most add that this aint so easily done under the hood. You'll need to put a pinch bar behind the pipe wrench and get fulcrum force from the water pump.
The water pump in a vise lets you employ a larger pipe wrench or put a pipe handle extension on the little pipe wrench.