Use this double adapter set to attacha Companion Seat to your Peg-Perego YPSI stroller or Agio Z4.

This set includes the upper and lower adapters needed to create space between the main stroller seat and lower Companion Seat. If attaching two Peg-Perego / Agio Primo Viaggio series infant car seats for twins, you will also need to purchase an additional set of Primo Viaggio links (sold here) for the second car seat.