I ordered this tank and pump as replacement for what I thought was the same exact looking item that came with an airhorn kit. To my surprise, even though it looks identical, this tank and compressor does have some upgrades over what came with my airhorn kit. The one major thing I did notice was the line going from the compressor to the tank actually has a one-way check valve so that when the compressor is pumping the air to the tank the air does not go back and pressurize the pump, making it work harder. My old tank did not have that, and it always seemed to struggle harder the more psi that got into the tank where this one I do not really notice it struggle at all. The other thing that I have noticed with this compressor kit may be due to that what valve it seems to run much quieter than my old. The only issue that I seem to have with it is it does have a small leak somewhere that I do need to find because by morning I have to fill the tank again. Where my old system would probably go for a few days before I would have to turn it on, but it still would not be completely dead. So, even though it has a slight air leak somewhere due to the other upgrades, I am still going to give it four stars.