TWO-HOSE USE: Allows connection of two hoses to dust extractor SECURE FIT: Locks into dust extractors hose port SPECIFIC CONNECTION: Designed for use with bosch gas20-17a(h) dust extractor TETHERED PORT CAP: For covering an unused hose port and directing all of the suction power to a single connected hose DURABLE CONSTRUCTION: Features high-quality construction for strength and durability