Cool summer from filling water balloons. variety balloons size and different function water pump, filler and 

this easy tie. filling nozzle with threaded and non-threaded nozzle 

Water balloons are typically filled at an indoor faucet, an outside tap, or at the end of a garden hose. 

Multiple types of filling nozzles are available on the consumer market and come in threaded (3⁄4 in [1.9 cm] standard in the U.S.) and non-threaded types. Non-threaded nozzles are called filling funnels and may be difficult to use.