ThisHEOS filler cap for motorhome, caravan and van tanks, WITH or WITHOUT overflow valve. It allows direct connection of hoses via the universal 1/2" Gardena coupling. It ensures fast, hygienic filling, without spillage or splashing, and in a minimum of time. Suitable for all types of water tank. Channels in the lid facilitate aeration during water supply. It does not have an auto-block feature when the tank is full. Supplied with reduction ring for hose diam. 67 mm (Dethleffs / LMC from 2010, ...) and flat gasket for tank with overflow.