Use this double adapter set to attach a Companion Seat to your Agio Z4 stroller

This set includes the upper and lower adapters needed to create space between the main stroller seat and lower Companion Seat. If attaching two Agio or Peg-Perego 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.