I ordered this not knowing it already came with the rheem vent kit, so I sent it back and recieved the refund. Then upon installation of the waterheater, I realized this tube had to be looped to form a p-trap, so it was very short after that. Codes here say it has to drain in a sutable place (floor drain, sink, outside, ect.. I had to move a sink closer to the heater to make it work. I now wish Id kept the second one to join them together so my sink could have stayed where it was.