Spectra Breastpump Backflow Protector, Flange-side

Breastpump backflow preventer, this half is inserted into the flange.

My wife often drops her flange+bottle before pumping, with the Spectra parts this usually leads to the nipple inserted into the flange snapping off inside the flange itself. I designed+printed this to be a drop-in replacement for the half of the backflow preventer.