Sealand 1 1 2 Nozall Plas Pumpout AdpWill 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 pumpout 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. Simple to use: Just screw NozAll adapter into your waste deck