Spray tank
A spray tank was a component that could be installed on board  starships. 

Montgomery Scott installed a number of spray tanks on board the  in 2268 to assist in the ship's mission to decontaminate Ariannus, which was threatened by a bacterial invasion. 

The spray tank applicator, which was deployed from a dorsal section of the ship, applied the decontaminate to the planet's atmosphere from orbit. The procedure was repeated for a second orbital run for maximum effect. ()

Spacecraft components