"There's a lot of turnover in the NFL each year," Tapp told the Seattle Times. "I'm happy to have another opportunity to play. I'm sad to be leaving Seattle. This is the team that gave me a chance for the past four years. The fans were awesome. It's a business. It's a part of the business."
The Eagles were interested in Tapp when he played at Virginia Tech, according to general manager Howie Roseman.
"Darryl is an up-and-coming player in this league, in my opinion," Roseman said. "He's a good player and a good person. ... We believe he'll be a good addition to our defensive line."
The Associated Press contributed to this report.