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After taking apart a full automatic foam soap dispenser, I went online and hunted for a foam pump on its own. These pumps simultaneously pump soapy liquid and air together to create a continuous foam-soap on demand.
I found just one listing on eBay with the pumps:-
www.ebay.com/itm/264812164691
The total with shipping is currently $4.54. Lets see if he puts the price up.
The construction is very typical for these. A three diaphragm pump with direct motor drive swash-plate style, and matching round rubber umbrella flap valves to make sure the air and liquid end up going through multiple meshes to whip it up into a mousse.
The liquid I was using was a mixture of washing up liquid (dish soap) and water. About 1 part soap to 4 parts water.
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