Kleinn Air Horns Single 25-Inch Roof Mount Horn includes a Single Chrome Plated Zinc Alloy Roof Mount Truck Horn. This Kleinn Air Horns Single 25-Inch Roof Mount Horn features Square Trumpet Openings and Covers that keep any debris tumbling out on the road away from the horns. This Kleinn Air Horns Single 25-Inch Roof Mount Horn is loud, deep, and easily heard over the road or truck sounds. The Kleinn Air Horns P/N 330 Roof Mount Air Horn Fittings Kit is required for installation. The Manual Valve Or Electric Solenoid Valve are not included.