To sum this up if you need an air pump for your large fish tank this is the one to get. I, like many people have been through a large number of air pumps and they all wear out over time putting out less and less air. Most of the pumps do not have replacement parts so you are stuck buying yet another pump. I bought the 15 LPM model and it is MORE than enough to run 2 or 3 large (120 gallon) tanks with large airstones. My last pump was a EcoPlus Commercial Air 1 - 1 to 18 Watts 793 GPH and it worked for awhile but it too was losing pressure. It was very noisy in comparison and always running hot. This pump is built like a tank and is VERY quiet compared to the old one. Yes this pump is expensive in comparison to others but it is proof "you get what you pay for". Do you want to keep spending over and over buying cheap pumps? From what I have read this pump also has a rebuild kit but it is only needed after several years of use.It comes as shown in the picture. The adapters are plastic and I would have preferred them to be brass. You will need to purchase all other plumbing on your own so I recommend getting an adjustable gang valve to control air flow because it puts out a LOT of air for its size.I just got this pump and I am impressed . Hopefully it will last longer than the year or less that the others did.