Sentence:  There are many types of fountain from which persons may drink by taking the nozzle of the <WSD>bubbler</WSD> into the mouth, and this practice is common; furthermore, there are many types in the use of which water from the lips of the consumer falls back onto the <WSD>bubbler</WSD> at the point of outlet. 
Meaning of the word marked with <WSD> tags:  A drinking fountain.