Supplies » Nursing Products » 9V Portable Vehicle Adaptor by Medela 9V Portable Vehicle Adaptor by Medela 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 20 25 30 40 50 75 100 The Portable Vehicle Adaptor is compatible with Medela 9 volt breastpumps. Additional Details: Works with: Pump In Style® Advanced Backpack, Pump In Style® Advanced The Metro Bag™