Unused portable foam sprayer. The GLORIA Foam Master FM 50 has a filling capacity of 5 liters (1.32 gallon). Can be pressurized to 3 bar (~43psi).
I bought this a couple years ago thinking I would use it in our apartment parking lot to wash the car, but ended up finding a pretty nice coin wash nearby. It's since been sitting in storage.
It sells for north of $200-250 brand new and is mostly sold in Europe, so pretty hard to get anywhere in the USA.
$160 shipped.
https://shop.gloria-garten.com/clean...ter-fm-50.html
can be set up with a portable air compressor like in this video:
https://www.youtube.com/watch?v=roXBRE1kSQk