Bryan Rust scored two goals, giving him 100 in the NHL, and Jeff Carter scored for the Penguins (34-15-3), who have won six of seven and lead the MassMutual East Division by two points over the Capitals, who have a game in hand.
The Penguins defeated the Capitals 5-4 in overtime on Thursday and were 6-2-0 against Washington this season, with three wins in overtime and one in a shootout.
"They're a divisional team, and it was our last two games against them this year, so I think we just wanted to leave our mark and try to do the best we can and just try and get wins," Jarry said. "It's that time of year that we're at, just trying to rack up as many wins as possible and put ourselves in a good spot."
Ilya Samsonov made 23 saves for the Capitals (32-14-5), who played a fourth straight game without forward Alex Ovechkin.
"I think they all played out the same. Almost every game was identical," Washington coach Peter Laviolette said of the series against Pittsburgh. "The team that capitalized won the game. Tonight ... it was definitely not volume. It was a couple things that happened and they got a couple really good looks and they put it in."
Pittsburgh took a 1-0 lead when Washington forward Garnet Hathaway fell, resulting in a breakaway for Rust, who scored on a wrist shot from the left circle at 2:56.