ProBlaster complete chrome compact dual air horn package with 120 PSI sealed air system. ProBlaster chrome dual truck air horns with all-metal trumpets 16.75 in. And 14.5 in. Think fire truck or ambulance horn but LOUDER! Flat mounting design allows for easy mounting behind the grille, engine compartment, or on frame rails. Includes an easy-to-fit, 120 PSI, 0.5 gallon air system. Add-On: N/A Attribute 1: Features Model 102 compact dual air horn Attribute 2: 0.5 gallon air tank Five 1/4in. Jpg Prop 65 Yes/No: Yes Title: Kleinn Air Horns – HK2 – Chrome Dual Air Horn Kit. Processing begins as soon as an order has been placed, therefore we cannot change, cancel or modify orders once they have been confirmed. Most e-mails are answered within 24 hours, including weekends and holidays.