I bought this stuff about 5 years ago to use in a pond we were constructing, however the pond would not hold water and I never ended up using or even setting up this aeration system. It is an air pump, lots of weighted air hose and two diffuser rings. It has been sitting on a shelf in my shop for a few years so it is a bit dirty etc. I plugged the compressor/pump in just to check it and it ran perfectly. Located in Rickman