A low velocity fog applicator is held in an all-purpose nozzle by a bayonet joint. The applicator is prevented from rotating in the joint by __________.

Correct Answer: Option A — a spring-loaded catch

Low velocity fog applicators utilize a bayonet coupling for rapid attachment to all-purpose nozzles. A spring-loaded catch automatically engages a detent or notch in the fitting, positively locking the applicator to prevent dangerous rotation from high-pressure water reaction forces.