Cast iron compressor pump ID needed

[CGT80]

This pump is on a 120 gallon tank I picked up for my WABCO-dresser-leroi 2AVC/400. I can not make out the numbers on the front and have not seen one quite like this on GJ. It is similar in size to the WABCO 400 which is a 5hp pump and it accepts 3 belts. I would guess this is a 5 to 7.5hp pump. It certainly appears to be single stage. While it looks a little cheap or like a knock off and the valves are under the top plate, it is cast iron and isn't as generic looking as some. It certainly doesn't match the looks of the two WABCO compressors I have or the other big name brands who make industrial quality pumps. It turns fine by hand and moves air. I haven't had time to open it up and check the valves and bore/stroke size. Does anyone recognize this pump and have any specs on it?
https://www.garagejournal.com/forum/media/20220204_152322-jpg.114300/
https://www.garagejournal.com/forum/media/20220204_152322-jpg.114300/

 

[Packard V8]

Based on similar finds, my guess is someone has converted a refrigeration compressor pump.

jack vines

 

[American Locomotive]

King valve with the the test port is a dead giveaway it started life as a refrigeration compressor!

 

[MacMcMacmac]

It's a Brunner. Probably an A650. I'm not sure if it useable with the current head.

brunner-manual.pdf

ln.sync.com

 

[CGT80]

Thanks for the info guys. At least I know A little more for further research. When i have time, i might pull it apart and see what the piston ring setup is.

 

[kennylauer]

It appears to be a Westinghouse air brake, also sold as a Ritter dental compressor.

 

[68futura]

This is a Brunner R-2000 ref compressor. If you'd like to use it as an air compressor, it as simple as plugging a port in the casting to isolate the crankcase oil from the top end. It's been a while since I've done it, but PM me if you'd like more onfo