KAOS Portable Battle Pump is the number one water balloon filler to date! Just fill, tie and throw!It s that easy 1. Place balloon over nozzle and pump it up with water. 2. Without Removing Balloon, stretch it under tie-not stick. Then, loop back over. 3. Remove Balloon opening from nozzle and slide through tie-not stick slot. 4. Quickly pull balloon off the tie-not stick. Have fun!