After Simon Holmstrom’s one-timer missed the net, the puck bounced off the end boards and right to Pelech on the opposite side, who beat Devils goaltender Jacob Markstrom glove side from the left circle.
Holmstrom had a goal and an assist for the Islanders (20-13-4), who snapped a three-game skid. David Rititch made 30 saves.
Brett Pesce scored for the Devils (20-16-1), who have lost two straight games. Jacob Markstrom made 23 saves.
Pesce gave the Devils a 1-0 lead at 15:35 of the first period. Nico Hischier found Pesce all alone in the high slot before he beat Rittich high glove side.
The Islanders tied it 1-1 at 12:10 of the second period when Markstrom came out of the crease to play the puck and turned it over to Holmstrom, who scored into an open net.