Kleinn Air Horns HK2 Complete Dual Truck Air Horn Package - Chrome Features Model 102 Air Horn; Packaged with 120-PSI Sealed Air System 0.5-Gallon Air Tank (Five 1/4-Inches NPT Ports) 120-PSI Rated Air Tank Made in the USA All Hardware is Included Features Model 102 Air Horn; Packaged with 120-PSI Sealed Air System 120-PSI Rated Air Tank Made in the USA All Hardware is Included