I picked up this machine to go on tig welder, this machine is awesome! Super quiet (Much more quiet than my welder) and runs off of just a standard 120-110v outlet, Has quick connections. I cleaned it out and ran a couple gallons of destilled water through it. It has a 2.375 Gallon Reservoir. I'm adding this 1 gallon of Lincoln low conductivity coolant in case.

Directly copied from lincoln electric website - "Designed to integrate directly with the Power Wave® S-Series power sources, the Cool Arc® 55 is a rugged, reliable water cooler capable of cooling torches rated up to 500 amps"