Feature: 1. Aluminum Alloy Material: Made of aluminum alloy, this undercoating gun is light in weight and corrosion resistance, easy for your operation. 2. Main Application: For automotive rust protection when used on dual rod nozzle extensions, chip guards, truck bed liners and other items. 3. Scope of Application: This spray gun can be used to apply coatings of different viscosities and various textures. This gun is specially ideal for applying for Herculiner and all other one or two component sprayable truck underbody coatings. 4. Excellent Performance: You need to assemble the spray gun and put it into use, it sprays very evenly and efficiently. 5. Wide Accessibility: This spray gun is suitable for 90% of the chassis glues on the market, you can take it home with confidence. Specification: Item Type: Air Undercoating Spray Gun Material: Aluminum Alloy. Package List: 1 x Spray Gun1 x Pressure Gauge1 x Intake Connector1 x Aluminum Tube1 x Extension Hose Note: The inner diameter is 40MM, please buy carefully if the inner diameter of the bottle is different.