"It is intended for use with Bosch GAS 20 L SFC Professional. The Suction Regulator Control is a dust extractor handle with suction regulator.
Suction regulator control
• External Dust Extraction Device • Suction Regulator Control is a dust extractor handle with suction regulator • Intended for use with Bosch GAS 20 L SFC Professional • For Bosch dust extractors