Air cleaner / filter adaptor. screws on to 76/ 276 carb, lip on inside face, 1-1/2 inches OD. Plated steel, NOS. For Volks air filter. Original part number MT12/NC/12899 - Adaptor, Carburettor to Flexible Tube 3842 - Air Cleaner Double Elbow Adaptor (Carburettor End)