Rubber float chamber adapter for SU HS2 and HS4 Carbs. These are used in twin-carb applications to set the carburetor floats at the proper angle. If you have sourced carbs from an AH Sprite or MG Midget (which mounted at a 20° angle) you will need a pair of one each, right (rear) AUD2179 and left (front) AUD2178 to restore the correct angle to fit a classic Mini manifold. Ref: AUD2178, AUC1316.