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I read somewhere that a Nathan K5 series horn is rated for 70 CFM at full flow.I have my stock airtanks and they work fine because you do not have to use them that long to get attention. My air system is set for 120 psi and the horns will work at 60 psi. I can blow the rail crossing signal...

Thats why I have a manual valve, so I can control the volume. I do use them in parades carefully watching for small kids. the trainhorn can be quieter than the stock horn with the valve slightly pulled and have talked to people after the parade and they say the horns where not to loud and have...

I have K5HL'S on my 5ton front fender. I used 3/4" line and a manual trainhorn valve mounted on the dash.