I've got a big bronze Leslie Tyfon A-200-L tug horn up for grabs on
eBay. It's a little bit of a fixer upper, so I started it low with no
reserve and gave a detail description. This horn needs a pretty serious
air supply for full output, it is rated for up to 300 psi for maximum
output, but at that pressure it's sucking over 600 SCFM. At 150 psi,
it's pulling a more reasonable 200 CFM. It can be used on 40-100 psi if
you have to remove 1 of the 3 bronze diaphragm discs. This horn
requires a minimum of 60 gallons of air to be useful for proper
signalling.

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=6597032944

-Adam