Tubing, hoses and piping for delivery of liquids, semi-solids, fluids and gas, including flexible and segmental tubing, hoses and piping of adjustable length, fixtures and fittings in this class for such goods including tubing segments, sockets, connections, end fittings, branch fittings, elbow fittings, moulded plastic nozzles being components of segmental tubing, hoses and piping, all of the aforesaid goods not being of metal