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Watertwin: suitable for filling tubes where the reservoir caps have 3 locking pins and an outer diameter of 78 mm. Please check before ordering, there are different sizes. System connection: With this water filling aid, you can be sure that your filling hose stays where it should be: at the tank connection. No more fixing the filling hose, no more unpleasant surprises when the hose of the water filler pipe falls on the ground and starts to work on its own. Perfect control: by removing the supplied Aqua-Stop clutch, the water supply can be interrupted at any time, it is simple, safe and fast. Thanks to the standard 1⁄2" plug-in system, the included components can be freely combined and can be supplemented at any time according to your needs. Integrated double connection: after the end of the tank process, the two water hose fittings are inserted onto the integrated double connection. The reservoir hose is now closed, it can drain residual water into your vehicle and prevent insects from getting in. Easy to use: please only slightly tighten/apply the Waterwin water tank adapter, the adapter does not engage. Insert the tank adapter with the overflow so that it is located in the upper part. With strongly curved filling spouts, there may be backflow when filling with a strong water jet, which allows water to escape from the overflow. In this case, insert the small hose provided onto the inner connection or reduce the water supply. From Camper to Camper: all our adapters are available here: B091B4VLPZ (enter in the search field), produced in Baden-Württemberg/Germany, by Camper for Camper powered by MaJoCompTec. Box contents: 1 x MaJoCompTec Waterwin adapter for 3-pin tank cover D: 78, 1 x Twin connector, 1 x 1⁄2 inch hose connection with water stop, 1 x short hose extension, 1 x warning sticker, accessory kit to choose from. Please note: thanks to the durable countertop surface, the WATERTWIN adapter does not require a rubber seal.