IPI Industries B.E.R.G. (Breeze Extended Run Generator System) Systems are made with Aerospace grade material that will not be damaged by gas, freeze in the cold or fade in the sun. It has a flexible hose and all of its systems have a very easy, non-invasive set-up. Each system keeps your generators running for an extended period of time. You can use your own gas tank of any size to keep it running for a longer or shorter period of time, the tank just needs a drop tube. B.E.R.G. Clam Systems give you the option of buying IPI Industries B.E.R.G. Systems without the Attwood gas tank included. The product will say Clam after it if it does not include the fuel tank. Each Clam System includes a cap assembly, B.E.R.G. hose assembly and all necessary fittings and connections.