Hey John...I'm not exactly sure the size of the cooler (no markings on it) but if I had to guess its probably about a 60 quart (15 gallon) cooler. It works great. Fits perfectly in the boat and I literally walked into the Ace Hardware store down the road and had the fittings in my hand in about 5 minutes to convert from the cooler drain (standard garden hose diameter) to the 1 1/4" water intake hose on the boat. I think the fittings were about $7 total. Hook it up, fill the cooler and keep the hose running to keep the cooler tank full. Very easy and surprisingly not even that loud on land. And here I was thinking that I would be bothering the neighbors!!!