I built a set years ago using an AC compressor to supply air to pressurize the suds solution in a surplus beer keg and to supply air to the foam units at the end of the boom.
The foam units are simple a piece of plastic pipe with plastic pot scrubbers stuffed in.
I used 4 surplus 12 Volt solenoid valves, 2 for each boom, one for air, one for suds mix. A couple of brass needle valves control the air flow and the suds solution flow.
The air and the suds mix meet in a little plastic "TEE" just before each of the foam units.
Darned thin worked pretty good. I haven't used it since I quit farming in '97, but still have the sprayer stored away.
Could snap a couple of photos in the next several days, if you'd like.
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