I bought the cheapest garden hose I could find (an old worn out hose would work as well) and cut it short (2-3 feet) on the end with the connector to the hose bib. I connect it to my regular hose with a pistol nozzle (threaded on spray end). Shove short hose down drain and squeeze nozzle with as much or little pressure as needed to flush A/C drain. I picked this tip up when I saw Munn's A/C guy use this to flush A/C on service call.
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