Unique Sports Ball Doctor seals leaks in valve-inflatable balls without a bladder. Directions | ? Be sure ball is deflated ? 1. wet nozzle of syringe 2. carefully insert into valve opening by pushing straight in. Do not twist or rotate 3. be sure to push entire nozzle all the way in. Depress plunger all the way and pull out slowly 4. inflate ball and start bouncing vigorously to spread sealant on inside walls of ball. Single use 1 oz syringe.