Abstract: A double hose having a hose contained within a hose. First and second hose assemblies to be joined together so each have an outer hose and an inner hose. Ends coupler parts of the inner hoses are maintained in a concentric relationship within coupler parts on the ends of the outer hoses. The coupler parts are joinable to each other. One of the ends of the inner hoses extends beyond its corresponding coupler part to form a male and is received in the end of the other inner hose within the other coupler part. As such, when the flanges on the outer coupler parts of the outer hoses are joined together the inner hoses are joined to form a fluid tight seal.