If you use an external water filter, your long hose goes from the tap to the filter, and this short hose is used to connect the filter to your caravan/motorhome water inlet. It also acts as a space-saving, drip-free storage method for your filter while in transit, and assists with easy back-flushing of the filter after use. These filter-to-van attachment hoses are made of the same high-quality, taste-free AS/NZ4020 hose as the rest of the Flat Out range (with the German PU liner). They feature beautiful and ever-so-practical brass fittings and take up very little room. 1.5m: Best for filter connection on high inlets and/or if you wish to push the filter under the van. Can act as an extension when your normal hose is just a fraction too short. Works for drip-free filter storage when traveling, and can be used for close-range tank filling if you are skilled at maneuvering your van. An easy length to take the filter back to the tap for back-flushing.