Silicone tube for Medela Swing Breast Pump This tube originally had a two tone yellow and white adapter on each end of the tube, but the new deisgn has a cream adapter one end and a large adapter the other end. Either design will fit the pump. It is made of soft cloudy looking silicone. It is designed to be used specifically with the Medela Swing Breast Pump. This tube is much shorter than the tubes for the Pump In Style, although the ends look the same. The length of the tube affects the suction of the pump.