I just run air from my compressor in equipment room out to an air machine on side of building or wherever is convenient for cars or trailers. It’s easiest money at the Carwash
Some companies sell such a unit. Make sure the compressor amperage draw does not exceed the Vacuum Motor draw and use an Open Chuck so it does not start under load.
Some companies sell such a unit. Make sure the compressor amperage draw does not exceed the Vacuum Motor draw and use an Open Chuck so it does not start under load.