The Secco Dual Vac System supplied with this set confines both dust and water in a controlled environment. While polishing on site, the need to keep water spray from damaging expensive wooden floors and cabinets can be challenging. Concrete dust can also be difficult to clean and is dangerous to breathe. With the Dual Vac System, these damaging and toxic materials are contained and removed by simply hooking up your shop vac. To work with the shroud, simply attach the 6 inch DVS shroud to the wet polisher and attach your shop vac to the 1 1/4 inch vacuum adapter. After attaching your choice of tooling, set the tool flat and adjust the removable apron to the proper position. In addition to protecting your health and your working environment from damage, controlling the dust and water protects the tools internal bearings, armatures and electrical connections. The DVS system is compatible with all 4 and 5 inch diamond polishing pads, threaded backer pads and diamond cup wheels.