Do I need a bottle adaptor for my breastpump?

Toni79

I'm currently regestered for Medela PIS.  But I am thinking about changing it to the Ameda  Purly Yours Ultra (just becasue the Ameda is a closed system).

Anyway . . .  I know that if I used Tommie Tippie bottles I'd need to get an "adapter" to be able to pump directly into the bottles.

But . . . I registered for Avent bottles.  Do I need an adapter to pumo into these bottles?