I'm adding a coolant pump to my mill.

I have a bilge pump that would be perfect for it. The pump is 12v and draws about 2-3 amps.
I want to be able to run it off the 110 in my shop. I have a 9v converter and an 18.5v converter. Could I use either of these without burning up the motor? I don't care if the pump runs a little slower than its designed to.

I'll buy a 12v converter if I have to, but I'd rather use something I have laying around.