
Tractor trailers have these for quick deflation of the air tanks, no gloves, no wrenches, just pull the cord. In the past we bought them at a truck parts store to drain a high rise compressor. As an airbrush artist, I also use a smaller portable tank and place it on top. He steps on the gas every day of the week. I drew the attention of many artists to her. They're a lot easier, regardless of your compressor and settings, meaning you'll empty your tank more often. All air compressors I've come across use the same release valve. They are standard size.

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