In Tuscan, there is a unique phonetic phenomenon known as ‘gorgia’: [k], [t], [p] become [h], [θ], [ɸ] in intervocalic, or postvocalic before a liquid consonant [r, l], position.
These phonemes are absent in italian languages.
Etruscan language is an obscure language, all we know is some phonemes, including the 3 above, and that it wasn’t indoeuropean.
The Etruscans epicentre was Tuscany, and the civilty lasted almost a thousand years before getting conquered by the Romans.
But obviously the civilty didn’t disappear and the language was, at the very minimum, spoken until the last years B.C. .
The main theory, and the only one with some basis, for the gorgia is an Etruscan origin based on the 3 phonemes absent in Latin and all other italian modern language, but present in Etruscan, non IE language, and in Tuscan.
The Etruscan language in time disappeared in favour of Latin but probably, they passed some traits in the local Latin that eventually evolved into Tuscan.
I live in the area that according to some researches still has a lot of Etruscan DNA, and the local Tuscan dialect has a lot of endemic words, non existing in other dialects, with preroman origins.
It is beautiful how a language extinct from thousands of years still has big influence in the local language