Will make emptying your holding tank as clean, easy, and fast as making a trip to the gas station. Provides airtight seal. Cone-shaped design matches exactly with the cone shape of black rubber nozzles found at most pump stations. Clean and efficient. Eliminates need for messy water source to create sufficient vacuum to empty holding tank contents. Made of heavy-duty, glass-fulled nylon. Just screw NozAll adapter into your waste deck fitting. Works with both rubber nozzle and cam-operated types of suction hose fittings.