The Twins claimed Kowar off waivers from the Mariners on Tuesday.
The right-hander was designated for assignment by the Mariners last week after they acquired Jhonny Pereda from the Twins, so this ended up being somewhat of a trade. Before landing on the injured list with a shoulder impingement in August, Kowar posted a 4.24 ERA, 1.24 WHIP and 15:7 K:BB across 17 innings out of the bullpen for Seattle.