The Mets sent cash to the Diamondbacks in exchange for lefty reliever José Castillo, who had been designated for assignment.
To clear roster space, the Mets DFA’d righty Kevin Herget.
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Castillo, a 29-year-old with 45 games of major league experience and a career 5.21 ERA, becomes a depth option for an organization that has needed southpaws.
Both A.J. Minter and Danny Young are gone for the season, leaving Génesis Cabrera as the only lefty reliever on the 26-man roster.
The Mets already had signed the rehabbing Brooks Raley to become an option later in the season.