Learn Spanish (Latin America): El plomero ha arreglado la presión, es decir, ya no gotea. - The plumber has fixed the pressure, that is to say, it does not drip anymore.

Both es decir and o sea are used to clarify or explain something in different words, meaning "that is to say" or "in other words". They are mostly interchangeable! However, es decir sounds a bit more formal, while o sea is very common in casual, everyday conversation.

I've learned that "plumber" is fontanero. Why does this sentence use plomero?

In much of Latin America, plomero is the standard word for plumber. It comes from the word plomo (lead), referring to old lead pipes. If you are learning Spanish for Spain, you will hear fontanero instead.

How does ya no work here to mean "not anymore"?

While ya often means "already", placing it directly before no changes the meaning to "no longer" or "not anymore". Unlike English, where "anymore" usually goes at the end of the sentence, Spanish keeps ya no grouped together right before the verb (ya no gotea).

Why use the present perfect ha arreglado (has fixed) instead of the simple past arregló (fixed)?