There is no definitive answer to this question as the size of an air pump for a 16 inch air srtone will vary depending on the specific needs of the individual. However, some general tips that may help to choose the right air pump for a 16 inch air srtone include considering the size of the room that the pump will be used in, the type of air pump (pump-type or hand-held), and the type of air pressure that the pump will be used with (high or low). Additionally, it is important to consider the cost of the air pump and the time it will take to get the pump working properly.