Hose Reducers For over 80 years, Truco has been producing rubber hose reducers for mining, agricultural and industrial applications. They are ideal for when two different-sized pipelines need to be connected via a rubber hose connection in order to accommodate any misalignment. Used in a variety of industries where fluid or gas is transferred, the purpose of a hose reducer is to reduce the diameter of a hose or a pipe so it connects to a smaller fitting. Available in a variety of shapes and sizes, they can also be constructed of metal, or plastic, requirement dependant. TRUCO produces both concentric and eccentric flex pipe reducers.