17 Couplings and connections for pipes, flexible pipes and hoses; moulded parts for pipes, flexible lines, pipes, hoses and connection pieces for this purpose (including valves) as well as connection pieces for hard pipes, all not of metal; non-metal hose connections; non-metal pipe connections; connecting sleeves for pipes, not of metal; non-metal pipe fittings; connection pieces for pipes, not of metal; packing, closure and insulating material; pipe sleeves and branches for pipes of glass fibre; glass-fibre-reinforced flexible pipes, moulded parts for pipes, pipe sleeves and pipe connections; glass-fibre-reinforced flexible plastic pipes, moulded parts for pipes, pipe sleeves and pipe connections; glass-fibre-reinforced flexible polyester pipes, moulded parts for pipes, pipe sleeves and pipe connections; sealing rings, water-tight rings, plugging rings for pipes; reinforcing material for pipes, pipe sleeves, pipe moulded parts and pipe connection pieces; seals for pipes; valves of rubber or vulcanized fibre; pipe moulded parts, pipe sleeves and pipe connection pieces of glass fibre; glass-fibre-reinforced pipe moulded parts, pipe sleeves and pipe connection pieces; pipe moulded parts, pipe sleeves and pipe connection pieces of glass-fibre-reinforced plastic; pipe moulded parts, pipe sleeves and pipe connection pieces of glass-fibre-reinforced polyester; reinforcing materials for pipes, pipe moulded parts, pipe sleeves and pipe connection pieces; pipe moulded parts, pipe sleeves and pipe connection pieces not of metal; parts and accessories for all the aforesaid goods