This is a used teco tr20 aquarium chiller. It has Worked flawlessly for 2 years. It doesn't have any issues and you can add a heater and UV sterilizer. Can easily cool large tanks. I've kept up with regular maintenance still looks clean on the inside.this is italian made Beast. I paid well over $1,200 for this unit new. Willing to trade for a nice OG bounce Mushroom, but $400 cash is king. PM me.