Lugsulation seal is another variant of Lugsulation flex. Here the upper side is the same. However, the main feature is the lower side of the sealing surface. This preferably accommodates a cylindrical dome extending to the contact element. Depending on requirements, this seal can be designed radially as a lip, axially as a tube, or as a combination of both sealing directions. These versatile seal types make the Lugsulation seal highly adaptable. Lugsulation seal can also be used with a plastic insulated cap nut instead of a contact screw. As an example, this design is used for inverters that convert direct current into alternating current or vice versa. Suitable for sealing internal and external threads!