The BOSCH VX450 Vacuum Hose Y Connector is designed to connect two vacuum hoses to the GAS20-17A(H) 300-CFM Dust Extractor. The BOSCH VX450 Vacuum Hose Y Connector optimizes the use of the GAS20-17A(H) for maximum productivity, by allowing the use of two 5 In. angle grinders be connected to it. (Note: OSHA guidelines call for 25 CFM per inch of wheel diameter when using dust extractors with grinders for tuckpointing, cutting or surface-grinding applications in materials containing silica dust.)