For sale is a Ingersoll Rand 234 Pump. This pump is used on popular consumer models of 5 HP vertical I-R compressor, such as this one. It does not bear some signs of having been used, although a lot of paint has chipped. I was told that it was never put to use, but was moved around a lot. I do not know whether to believe this and cannot guarantee that it was new. I tested this pump and spun it by hand, while blocking the outlet with another hand, and the air would come out strongly.
The specs are 15.5 CFM at 5 HP.