a nozzle assembly particularly useful in conveyorized washing or rinsing apparatus . the nozzle assembly of this invention includes nozzles pivotally mounted in a manifold and a motor for producing oscillatory motion thereof . the motor is mechanically coupled to each of the nozzles to pivot the nozzles back and forth through a given angle , preferably in a direction transverse to the direction of movement of products being conveyed . preferably , the motor is powered by the same fluid sprayed by the nozzles . the nozzles are arranged to produce 100 % coverage of the product surface being sprayed as it passes thereunder .