Thanks for the post Scattercash,

This is actually a Kellogg pump which Emglo used (they called it an "R" pump), it's a model 332 which you can find our site at the below link:

mastertoolrepair.com/air-compressor-pump...s-332tvx-p-5412.html

It uses a minimum 3 HP motor, I know that much. You can view more specs for this pump in the "specs" tab at the above web page.

It's a pretty beefy, cast iron pump so it requires a beefy motor to run it efficiently.

- MTR