PT Coupling 6026403040CX30A Aluminum Reducer Cam and Groove Hose Fitting, CXA Short Reducer, Stainless Steel 300(HBS) Cam Arms, 4" Coupler x 3" Adapter Suitable for connecting two hoses of different sizes Shorter than standard reducers for applications where clearance is limited Coupler at one end and adapter at the other Aluminum for lighter weight and resistance to corrosion 300 stainless steel cam arms for resistance to corrosion