Exemplary embodiments are directed to deck jet systems including an adjustable cover and flexible finishing cap. The deck jet systems include a housing with threads formed on an inner surface of the housing. The deck jet systems include an adjustment ring with threads formed on an outer surface of the adjustment ring complementary to the threads of the housing. The deck jet systems include an adjustable cover, the bottom surface of the adjustable cover being inserted into the proximal end of the housing and supported by a top surface of the adjustment ring. Engagement of the threads of the housing and the adjustment ring and rotation of the adjustment ring relative to the housing can vary an elevation of the adjustment ring relative to the housing which, in turn, varies an elevation of the adjustable cover relative to the housing. Exemplary embodiments are also directed to methods of adjusting a deck jet system.