Related על ברכות 7:5

The Beracha (blessing) for undiluted wine is Borei Pri Haetz (Who created the fruit of the tree) and it (i.e. undiluted wine) can be used to wash hands. [If] he added water into it, [then] the Beracha on it [becomes] Borei Pri Hagafen (Who created the fruit of the vine) and it (i.e. diluted wine) cannot be used to wash hands. [These are] the words of Rebbi Eliezer. And the Chachamim (Sages) say, “Whether this one (i.e. undiluted wine) or that one (i.e. diluted wine), the Beracha on it is Borei Pri Hagafen and it cannot be used to wash hands.”