I used 3/4 inch to disconnect the coolant hose from the heater core on the Silverado. Did it by hand with a flashlight, it worked great. Read a lot of reviews from people who got on The Battle Bus is trying to do the same. This one tool is all I need. Just place it on the heater core wire coming out of the firewall, pull on it until it's fully seated in the connector, push it with my fingers to release the clips in the connector, then twist the connector to pull it out and BOOM, it banged. EASY MONEY. Stopped a coolant leak since I changed the heater core plug, 3 weeks ago now. Not the heaviest plastic, but I don't break it and I'm rough with tools.
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