Non-metallic pipes in this class, including such pipes for use with pressurised fluids; non-metallic connecting apparatus for pipes; non-metallic couplings for pipes; non-metallic fittings for pipes; pipes made of synthetic flexible material; thermally insulated pipes made of plastic; flexible non-metallic pipes; fibre-reinforced pipes for use as pipe casings or pipe sleeves; flexible non-metallic tubes; flexible ducting of plastic, flexible ducting of rubber; flexible plastic films other than for packaging; sheaths of plastic materials, sheaths of elastomeric materials; parts, fittings and accessories for all the aforementioned goods, all being non-metallic