Airmaxxx Air Assist Load Leveler Kit For Heavy Hauling with On Board Air Management 1/4 Valves. Fits: 2001 – 2010 Chevy/GMC Trucks With 8 Lug Wheels will not fit trucks with rear sway bar. Replaces Factory Bumpstops Provides Up To 5000lbs Of Leveling Capacity. Kit Includes: 2 – Standard 2500lb Air Bag Springs Set Mounting Brackets With Hardware AM400 Pewter Air Compressor 1/4″ Stainless Steel Braided Leader Hose 1/4″npt Check Valve 2 – 1/4npt Brass Air Valves Premium 40 Amp Relay 15′ Roll of 1/4 Air Hose 200 PSI Single Needle Air Gauge with Mounting Bracket Air Hose Fitting Kit 12 Volt Electric Valve Control Switch 3 Gallon 6 Port Seamless Aluminum Air Tank 1/4 Drain Valve. Never exceed more than truck manufacturers maximum load recommendations.