Seattle tied it 2-2 at 5:06, five seconds into a power play, when McCann scored from low in the right circle by one-timing the rebound of a shot by Dunn.
"I just tried to go back side and maybe get a nice rebound there," McCann said. "The plan was to shoot. It kind of sat there for me, which was nice. … At the end of the day, we got a point out of it and points are huge right now."
The Kraken are 1-1-1 on a five-game road trip that continues at the Boston Bruins on Thursday.
"We're trying to get wins right now," Dunn said. "Disappointing. It's positive to get a point and hopefully with the third period, we bring that momentum into the game tomorrow."
The Devils, who next play Saturday against the Carolina Hurricanes, will try to win three straight games for the first time since Nov. 24-28.
"It's important," New Jersey coach Sheldon Keefe said of winning two in a row. "It certainly beats the alternative. These are two big points, important points. This was a tough game. … Stayed patient and diligent with our game and we get two points, and that's good."
NOTES: Hischier's two goals gave him 186 to pass Kirk Muller (185) for sixth place on the Devils/Colorado Rockies’ all-time list. He also scored his seventh career overtime goal, tied with Zach Parise for fourth most in franchise history. … The Devils have won six straight games against the Kraken and have never lost to them in regulation (7-0-2). … New Jersey is 8-2 this season in games decided in overtime or the shootout. … Kraken forward Matty Beniers had his five-game point streak end (three goals, three assists). … McCann has points in eight of his past nine games (five goals, five assists).