DANFOSS OIL NOZZLE 0.30 x 60 DEG S030F6102 Danf 013g600600 RAS-C2 TRV 8/10mm Ang The oil line in a burner is a flexible pipe and is used to attach the pipework to the oil burner. They are normally braided to add durability to the oil line, however, some oil lines are made from a heavy duty rubber that can be alot more durable .