Lactina Double Pumping System is for use as a manual pump and for single or double pumping with the Lactina rental pump.  Contains:  2 personal fit shields, 2 yellow valves, 4 white membranes, yellow piston, cylinder, vacuum regulator, pump connector, 2 tubes with adapters, 2 bottles with lids, one bottle stand, and instructions.  This kit would work with the Pump In Style Breastpump if the yellow connector is clipped off the end of the tubing.