The Capitals displayed their firepower in the last game firing 28 shots during the last two periods while producing three goals. I see the Capitals carrying that over into this game. The Islanders haven't been able to slow down superstar Alex Ovechkin. 
Washington, though, has a slightly below average defense that the Islanders can dent. The Capitals are on the brink of elimination so they would have to take plenty of chances if trailing in the third period, which could lead to empty net goals. 
The Over is 5-1-1 the past seven times the teams have met.