Salford have signed Wales international prop Jacob Emmitt from Castleford, with Reds forward Ryan Boyle joining the Tigers in a swap deal.
Both players have agreed contracts until the end of next season.
The move sees Boyle, 25, return to the club he played for between 2005 and 2010.
"Although it was tough in the close season, all you here now is positive stuff coming out of the place," Emmitt, 24, told the club website.
"I'm really looking forward to being part of the Reds' revolution over the coming seasons."