Air Horns

What are these canisters called and where can I get new ones?

I have an old truck horn similar to this: http://cgi.ebay.com/ebaymotors/Rare-Trumpet-Horns-Buick-Fire-Engine-truck-Delco-Remy_W0QQcmdZViewItemQQhashZitem4a9e532fabQQitemZ320483831723QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories What are these canisters called below the horn and where can I get them?

Public Comments

1. Those are just the "horn" They just put a "trumpet" on top. See this other item on e-bay, same thing only smaller trumpet.http://cgi.ebay.com/ebaymotors/NEW-12V-ELECTRIC-AUTO-HORN-CAR-BOAT-TRUCK-FORKLIFT-MORE_W0QQitemZ260549540695QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item3ca9f67b57