It's easy. Install an air fitting that fits your air hose, then attach the other hose with the atomizer attached and slide the hose onto the other connector on the bottle. Depressurize the air in the canister, then unscrew the canister from the top, add some A/C flush solvent, reassemble, then turn on the air supply (red button) and spray the air/das solvent on the component you are rinsing. Great product, five stars.
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