AquaThunder® spa jets are designed for maximum efficiency. The soothing water/air combination will give your next spa project great therapeutic massage action. The PVC housing makes assembly a breeze and threaded interchangeable jet barrels are available for a variety of combinations. The adjustable jet fitting is made with a flange so it won't interfere with the adjustment ring, making it easier to regulate the water flow. The pool finish can go right up against the outer flange, giving it a very clean look.