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Review title: Not good for deteriated pot metal coupler
Product review: I had to extract the GM pot metal heater hose coupler after breaking it off when replacing the factory leaker with a steel one from Dorman. This tool just made the hole bigger until it was the size of the remover. The deteriorated pot metal coupler crumbled like a cookie. I had to drill out 11/16" and then 1/2" NPT tap the intake to clear the threads of the old material. Don't waste your time trying to remove all the material from the intake threads as you chance damaging them, let the tap do the work and save yourself hours of frustration!
