Carbery said he's liked what he's seen from Mangiapane and how he's helped his linemates, Jakub Vrana and Hendrix Lapierre.
"For me, the way he's playing and stabilizing that line, that's why I made the move to put him on that line after the first game of the season," Carbery said. "He plays in every situation, power play, penalty kill, and for him, especially when you come to a new team, I said this the other day, it helps when you score and get on the board.
“Those are big goals. It's not easy to score on a breakaway in this league. They get a couple of them, 'Chucky' makes big saves and to go down there in those situations, up one, you really need a second on the road, huge goal. Huge goal for Mang and happy for him."
Sanheim scored from the left circle 34 seconds into the third period to make it 2-1 before Carlson put Washington ahead 3-1 at 1:38 with a goal from the left face-off circle.
"Obviously don't like giving one up right away after getting the momentum," Sanheim said. "Just an unfortunate bounce, goes off one of our guys' skates and in."
Philadelphia had a combined eight shots on goal in the second and third periods.
"There's a lot of guys in this room that are goal-scorers and we're going to get going here," Sanheim said. "I'm not worried about it."
Chychrun made it 4-1 at 14:07 with a one-timer from the high slot.
The teams will play at Capital One Arena in Washington on Wednesday.
NOTES: Carlson (two goals, four assists) and Strome (three goals, five assists) each extended his point streak to five games. ... Vrana's assist on Chychrun's goal was his 100th in the NHL. ... Flyers defenseman Nick Seeler had two shots on goal and two hits in 15:30 of ice time in his first game of the season. He had missed five games because of a nerve issue in his right leg sustained blocking a pass during a preseason game Oct. 1. ... Capitals forward Tom Wilson had his four-game season-opening goal and point streaks end.