It is a form of all the supplies and connections for pipes from an elbow, joint or plank. They are made in the same way as seamless pipes, as they do not have longitudinal welding and bear high pressures and there are all sizes of them.
Custom menu section
This is off canvas menu widget area. To enable it add some widgets into Appearance – Widgets – Menu Section, and go to Customizer – Main menu to set the icon position.