This flexible rubber connector cuff is designed to connect 2 each 4” outside diameter OD flexible dust collector hoses or PVC fittings together that are of similar sizes to achieve air-tight fitting. It is made from flexible rubber and will accommodate slight diameter differences in pieces. Item comes standard with 2 hose clamps. Connector is designed to connect hoses of fittings with outside diameter OD of 4 inches. Overall dimensions: 4” ID, 4-1/2” OD, 1/4” thick sidewalls, 2-1/2” overall length