Medela Pump in style tubing is difficult to clean. When it gets dirty, and can't be washed by water, it is time to install a new one for the safety of your baby. This replacement tubing for Medela breast pump is a retail package of a pair of two NEW tubings designed for Medela's pump-in-style breastpump, released after July 2006. If you don't know if this tubing fits your pump, see the photos of this listing. Buying the wrong tubing will not work for your Medela pumps.