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I tried to pry of a nozzle on my wreck donor car. Was not pretty. So I took off the check valve off as I know it works, but then decide to just undo one hose to check valve/sprayer on new car and put a air gun thing on the end and blew it out. Works great and left old valve on. Then noticed I was missing a hvac servo so replaced that and a bad servo. Hvac works nice. Productive 2 hrs in garage.