Firestone Air-Rite Standard Duty Air Control System - Dual Classic Gauge. Intended for use with most half ton trucks this Standard Duty Air Control System from Firestone can help regulate the temperature in your truck's cargo box which can greatly reduce fuel costs over time. Featuring dual usage mode the Firestone Air-Rite Standard-Duty Air Control System works in both "Tire" Mode and "Air Help" Mode to efficiently provide air to your tires at lower gas mileage. When "Tire Help" is not needed "Ballistic" mode can be activated to reduce tire pressure when needed saving you fuel and time. The Firestone Air-Rite Dual-Use System for Air Control is versatile and has a classic style monitor that can fit in your glove box or toolbox so you can use it in any situation. Features of Firestone Air-Rite Standard Duty Air Control System - Dual Standard-Duty Air Control System Dual Usage Mode For use with most 1/2 ton trucks Classic style monitor Package Contents: Firestone Air-Rite Standard Duty Air Control System - Dual Firestone 2178: Air-Rite Standard Duty Air Control System - Dual Classic Gauge