This attachment works as a suction cup to collect dust when drilling concrete holes from 1-1/2 inch to 6 inch. The 2 air chambers allow suction to be maintained while allowing bits to drill through. Even with Auto Filter Clean this attachment will stay suctioned to any vertical wall. The port is designed for 1-3/8 inch vacuum nozzle but can be used with either 1-1/4 or 2 inch.
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