Check the listing for details. WEN DCA004 4-Inch Elbow Connection Adapter for Dust Collection Systems. Condition: New. Listed at 17.15 USD. Remember when you had a clean workshop? Direct the flow of air around your shop with the WEN 4-Inch Elbow Adapter. This useful adapter installs easily, helping guide your 4-inch dust hose from your dust collection system to your woodworking machine. The durable ABS plastic construction provides maximum efficiency to your dust collection system when properly connected. Each 4-inch side measures in at 94mm inner diameter and 100mm outer diameter. Compatible with WEN dust hose models 28200 and 28221. Remember when you had maximum suction? Remember WEN. Direct the flow of air around 90-degree cornersAirtight design maximizes suction to help fight the harmful dust created by normal woodworking operationsConstructed from durable and long-lasting ABS plasticEach side measures in at 94mm inner diameter and 100mm outer diameterUniversal design compatible with the majority of 4-inch dust hoses on the market