Check the vehicle fuel pressure with the right hand gauge, and easily set cleaning pressure with the left hand gauge. Restores the original spray pattern more effectively, giving improved performance, fuel economy, and emission tests. Cleans carbon from intake valves, fuel passages, and cylinders with a professional carbon cleaning solution. Includes check valve for added safety. Updated design in more user friendly Set includes steel braided Teflon hose that resists solvents, 20 oz. capacity bottle, and redesigned gauge boots for added protection.