Beetle models manufactured after August 1967 have inspection/drainage holes at the bottom of the side heating ducts (sills) at the front and rear, which allow inspection of the inside of the ducts. These holes are factory-sealed with rubber plugs. After many years, these valves can harden and/or be lost. BBT now offers these valves in original quality from stock. 4 pieces are required for 1 vehicle.
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