Northstar Water Pump Socket by Astro Pneumatic. Used to remove and install the water pump on Cadillac Northstar 4.6 liter V-8 engines 1993 and later and Oldsmobile Aurora 4.0 liter V-8 engines 1997 and later. Drive end size: 1/2" drive, socket end size: 1/2", length: 2-5/16" and 6 points.

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