All the necessary pieces are included and are easy to exchange for the old ones. Indeed, the cup that holds the liquid is improved.
If you look on YouTube the direction are very explicit. A word of advice and that is take you time. The seal may not seem the right size but it. Follow diagram and work from both sides. At the end you will see a little excess. All you have do is push a little on both sides without letting go. Use your finger nail to seat. All you need is patience. Cannot do it fast. Goodluck
I love these canulas
Super soft and comfortable




















