Lock-On " Positive connection hose system. Anti-tip design. Convenient tank drain for easy emptying. Easy roll casters for greater mobility. Heavy duty. High quality cartridge filter for wet or dry pick-up. High quality drywall collection bag for fine dust pick-up. Large top carrying handles. Lock-on positive connection hose system. Onboard accessory storage. Oversized on-board tool storage. Tank drainShop-Vac Corpor