Introducing 4 in. Dust Collection Hose Y-Fitting Connector with Blast Gate and Dust Control Flex Cuff Set by POWERTEC. //4 in. Y-Fitting Dust Collection Hose Connector// This in.Y in. fitting is commonly used in place of in.T in. fittings, providing a smoother transition to branched off main lines where design limitations will not allow use for overhead runs. //4 in. Dust Control Flex Cuff with Hose Clamps// This coupler is designed to provide you with an airtight connection between a pair of 4 in. dust collection fittings or hoses. It's a highly useful (and reusable) dust collection system accessory, as it allows you to interchange fittings and connect adapters to keep all of your dust collection tools connected. These Flex Cuffs work exclusively with nominal 4 in. O.D. ports, hoses and fittings. //4 in. ABS Plastic Blast Gate// This manual blast gate helps maximize your dust collection system by regulating proper air flow to your designated machine of choice. Acting as an in-line gate to control the vacuum flow to specified areas of your work shop, it's designed to work seamlessly with a variety of flexible hoses, ducts, and 4 in. ports for an assortment of popular brands. Featuring a nominal 4 in. O.D. diameter, this unit will provide a perfect fit for most professional and at-home workshop dust collection systems. The blast gate perfectly suited to take on the abusive nature of sawdust, woodchips and other debris.