... Suitable for Tig,Mig,Plasma welding Product functionOld typeOtherNew typecharacteristicPumpIron pumpPlastic pump Big power 370W stainless steel pumpHigh flow, high lift, ... no rust, no blockCondensationSteel Pipe radiatorAluminum pipe radiator3-rows steel pipe, a large area of high-density cooling fins ... also have a big capacity water cooler for welding machine model, such as MD-1121, which 17 liter.