For connecting 2 dust producing devices. Via selection switch individually adjustable to one or two extraction ports. Tool free and fast connection. 1 Extractor Switch incl. 4 mufflers (without hose), Ø suction fittings, interior/exterior 35 mm / 40 mm (1.38" / 1.57"), Ø muffler interior/exterior 38 mm / 46 mm (1.50" / 1.81") Non-Latex