Non-Turbo Model

Install in the reverse order of removal.
Apply a thin coat of engine oil to the new O-ling, and then install it.
Tightening torque:

T: 54 N.m (5.5 kgf-m, 40 ft-lb)

Fig 1: Installing Adapter (Non-Turbo Model)
Courtesy of SUBARU OF AMERICA, INC.