Pools made of plastic materials primarily for swimming use and also for use in bathing, plastic water-pipes, non-metal roofing, non-metal roofing for pools; component parts of all the aforesaid goods not included in other classes, namely, non-metal roof trusses, non-metal roof coverings, non-metal roofing hips, non-metal roofing panels, non-metal roof flashing and plastic water conduits for roofs