This MagFitt™ coupling allows you to quickly and easily move a 4" hose from the dust collector to any machine fitted with a mating magnetic machine coupling.Magnetic couplings are perfect for shops that do not have a central collection system. Simply attach this coupling to any flat surface to construct custom adapters or a dust collection box, and then you to easily swap the hose from machine to machine without tools or cumbersome rigid connections.Features: Rugged ABS plastic construction Steel ring for magnetic attachment Bolts to any flat surface Easily move hose from machine to machine Works with 4" magnetic hose coupling (#189115)Specifications: Specifications: Material: ABS plastic with steel ring Mounting: Bolts to flat surfaces Use: Pairs with 4″ Magnetic Hose Connector (#189115) for quick, tool-free hose changes What’s Included: (1) MagFitt™ Magnetic Surface Mount Coupling - 4"