The silicone caulking arround the PVC fittings was dry on The homemade Cyclone I made yesterday. So I hooked it up and used it with my smaller 1 hp dust collector to sweep up the shop floor.. Fired it up, plugged up the hose and didn't hear any leaks, thought the galvanized lid was gonna implode....It picked up fine dust, shavings and pinkie sized pieces of scrap wood, most everything dropped into the can (1st stage), don't think a teaspoon of dust made it into the bag (2nd stage).