The whole house flexible fitting kit consists of two braided stainless steel hoses that bring water to and from the whole house unit. Usually a whole house water filter is fitted with rigid piping, either copper or plastic in line with your mains feed. This kit offers you greater flexibility in positioning your Whole House filter.
If the fitting is in an awkward position then flexible piping will help in the installation. The flexible fitting combined with the robustness of braided stainless steel offers you the necessary flexibility without restricting the water flow to and from the unit. (Flexible piping made for washing machines or dishwashers can substantially restrict the water flow)