In my experience (automotive) the compressors put the H in Hefty. That being said these seem to work quite well:https://www.amazon.com/Bicycle-Bike-Horn-Bell-Adults/dp/B000ACAMJC/

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Greatly recommend the large ones for automotive use: Ex: https://www.amazon.com/Viking-Horns-003A-Decibels-Compressor/dp/B07T32C4BW/