What tool is used to install a sealant cap?

The appropriate tool for installing a sealant cap is a sealant gun. Sealant guns are specifically designed to dispense sealants, adhesives, and other materials that come in cartridges. The gun allows the user to apply even pressure to the trigger, which in turn forces the sealant out of the cartridge and into the desired location. This precision is crucial to ensure a proper seal and prevent leaks in aerospace applications, where the integrity of seals is vital for safety and performance.

The other tools listed do not serve the same function. A wrench is typically used for tightening or loosening bolts and nuts, while a screwdriver is designed for driving screws. Pliers are useful for gripping or bending materials but are not suited for the precise application of sealants. Therefore, using a sealant gun is essential for achieving the correct application of sealant caps in an aerospace setting.