Non-metallic building materials, namely, surface water drainage systems comprised primarily of non-metallic drainage guttering and channels, storm water catchment pits, field gully traps, floor waste traps, parts for the aforementioned goods; non-metallic rigid water feed tubes; non-metallic couplings and attachments for pipes, namely, end outlets, plastic grates, plastic channels, end caps, corners and plastic leaf gutter guards; non-metallic pipe connections and extensions; excluding ground water and underground drainage systems and pipes and underground water storage systems