The Gasko was a Romulan starship that was in service in the late 24th century.
In 2370, the Gasko reported to Starfleet that it had seen the abandoned USS Rio Grande traveling through Sector 401 at warp 2 without any crew. (DS9: "Paradise")
According to the script for this episode, the pronunciation for Gasko was "gahs-KOH". 
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