A swaging tool for swaging fittings and joining separate tubes together. The swaging tool includes a removable head assembly having a head member and a first spring clip adapted to retain a first die to a portion of the head member. The head assembly includes a die block and a second spring clip adapted to retain a second die to a portion of the die block. The swaging tool includes a power unit assembly having a base member adapted to receive the die block and head member of the head assembly. The power unit assembly includes a moveable piston adapted to engage the die block so as to move the second die towards the first die during a swaging operation.