We recently purchased an OMTech 55W Laser for hobby use but did not purchase the external chiller radiator. The one that’s for for sale for around $150-200 price range is simply a “radiator” type cooler with an alarm wire that can be fed back to the laser. To me this seems like a rather ludicrous price for something that cools the tube to room temperature. This being said it was clear that when the laser gets heavy use the 5 Gallon bucket of distilled water (w/ 8 drops of algicide and 8 drops of dish soap) did heat up to over 75 degrees with a few hours of cutting. I wanted to keep the laser operating in the most efficient manner so I built a simple radiator chiller on the cheap using brand-new parts from Amazon for only around $40 and it works like a charm. No hardware was needed beyond what came with the purchase which also yielded a couple extra pipe clamps and some Gates hose: