Klaxon Air Horn

[Bowton Lad]

has to be single tone

Not true. Has to be single tone or twin tone ie. two notes sounded simultaneously. Two tone means means one note followed by another ie. the traditional horns used by UK emergency services before wailers became popular .

[dickspanner]

CS, I know what you mean about direct drive pumps, they do not even tough the train horns. I have a big compressor in my lock up and when I put air to the horns it is pretty dam loud. In fact when I discharged it last time some ceiling paint flaked off. RESULT.

I was thinking of a small calor gas bottle as a reserve tank and plumbing a saftey blow off and pressure switch etc, but these type of fittings and plumbing is not my strength hence asking if you still had all the stuff. Have a crewcab so was going to mount the bottle in cubbyhole

[Mr Bean]

I was thinking of a small calor gas bottle as a reserve tank and plumbing a saftey blow off and pressure switch etc, but these type of fittings and plumbing is not my strength hence asking if you still had all the stuff. Have a crewcab so was going to mount the bottle in cubbyhole[/quote]

Sorry when I scrap one of my projects the stuff goes back into stock for other similar uses. There are lots of tricks you can use for instance a pressure take off for a gas bottle can be made from an inner tube valve and retaining nut/ring fitted to a small penny washer. A hole can be drilled into the plastic protective cap to clamp this onto the bottle. Fuel tubing makes ideal pressure hose and an air valve can be made from a compressed air dust blower gismo. Or taps and stuff can be picked up from caravan acessory shops. As I said before the tricky bit is the Pressure switch which is rare as rocking horse turds to the scroungers workshop/experimental lab. Although I guess you might be able to use an oil pressure switch coupled tp a horn relay (as the oil switch has normally open contacts)
Cheers
Wolfie