A protective tubular encapsulant, often filled with a gel, used to contain one or multiple cabled fiber.
                                                            
                                                     
                        
                                                
                        
                        
                            Thin plastic tube around the optical fiber – providing protection and better handling of the fiber.
                                                            
                                                     
                        
                                                
                        
                        
                            A protective tube loosely surrounding an optical fibre, often filled with protective gel.
                                                            
                                                     
                        
                                                
                        
                        
                            A protective tube loosely surrounding a cabled fiber, often filled with gel.