I'm not really sure whether they were freon or propane tanks, both have threaded top fittings, looks like 1/2 NPT, and both have two threaded ports also 1/2 NPT. The one side port has a blow off valve, the other a pipe Both tanks have a ports in the very bottom connected together, and both have ports just away from the handle as well. My guess is that who ever built this welded on the extra 1/2 ports but they're not just pipes welded on, they look more like threaded rings applied from inside and welded on the outside. The tanks are as large in diameter as my barbeque tanks, most of the freon tanks I've seen have been narrower. I wonder now what they really were from originally.
The electric motor and pressure switch read "Penn Controls". The thing isn't that heavy and the wire cart is made to nest the compressor in place but isn't permanently attached.
With as well as all the connections are made, the angle iron frame holding the motor and pump are hobbled out of shelving and crudely bent and welded. My guess is who ever built it had a pro weld the tanks and they did the rest themselves. I suppose its limited to the max compression of the old Briggs motor when it comes to max pressure?
