Only on the inside. A tube on one of mine gave way, so I took the metal components (base) and reused it. One of my main objectives in the whole process was to replace the mouthpiece. The inner diameter of the pump bottle was a perfect size. Pulled out the pump mechanism from the cap and drilled a 5/16 hole in the cap for a drip tip. Cut the length proper so that when the tube was pushed down onto the base, the height was so that the metal tip would fit into the bottom of the drip tip, and the silicone cap provides the seal, just like the T2 originally had. Adheezed (yes, there's that word) everything but the screw cap. Now, to fill, I simply unscrew the top cap and squirt my juice in as always.