PART - Flange Silicon size 27

This is the size 27 Flange.

The standard pump comes with the size 24 but you may need to size up.

A breast pump flange, also known as a breast shield, is a plastic or silicone piece that fits directly over your nipple to form a seal. When you begin to pump, this creates a vacuum seal that should only draw your nipple into the flange tunnel for maximum milk extraction.