From bigclivedotcom.

By request – putting milk and cream through a foaming soap pump to see if it makes frothy milk and whipped cream.

These little pumps are very common in the automated foaming soap dispensers and can be bought cheaply online. They have a wobble plate style pump that sequences three diaphragms. One small one for the liquid and two larger ones for the air. The combination of air and liquid then gets pushed through a mousser, which is a couple of layers of mesh that break the big bubbles into smaller bubbles, and then do it again to make a thick foam.

The moussing meshes tend to block up over time, and you can clean them by pushing liquid through in reverse. That would involve opening this unit. The moussers that mount inline with the outlet pipe are much easier to clean by just reversing them momentarily and running the pump.
I think it was the mousser that had blocked in this instance, so maybe it almost whipped the cream.
I blew it clear and then ran soap liquid through the unit and it took a while to become normal mouse again, as the residual cream fat was acting as an emulsifier.

If you want to play with one of these little foam pumps you can get them from AliExpress (not a sponsor):-
https://www.aliexpress.com/item/1005006140859816.html
They run on 3-4V DC at about 600mA and can be used with standard aquarium style air line.

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