Papablic (Amazon) have worked well for me! They also have the pull tab for easier removal. Legendairy Milk has those, too, but they’re a little more expensive. They have a 6-pack of duckbills for $9.95

Or the 8-pack duckbills + 4 backflow protectors for $13.95

I pump with a Medela Pump In Style, here are my personalized accessories:

• Pumping bras (Lupantte and Momcozy are very similar and perfect for pumping purposes, but I don’t like them for regular wear)
• Medela PersonalFit Flex Breast Shields/Flanges because they are more comfortable than the kit flanges
• Duckbill valves I use these instead of the Medela white membranes and they SO MUCH easier and have better suction too
• Nipple Crack balm as nip & tube lube
• Medela storage bottles I have about 12 of these now and they are great for pumping and then immediately chilling in refrigerator without needed to transfer my milk to another container. And I use lanoish bags for my (tiny) freezer stash.
• Simple Modern tumbler for water
• speaking of hydration: lots of sparkling water (spendrift is $$$ but worth it) and coconut water since I’m notoriously terrible at drinking pain water

What parts do you need for the freestyle? In the first link there is a “connect to medela freestyle pump”. Would that be appropriate?

OR OR OR

I could cut the tubing and use this backflow protector.

Attach that to personalfit connector with duckbills.