What is the name for a flexible metal conduit connector that includes a neoprene sealing gasket?

The correct answer is the STG connector, which stands for "Sealing Type Gasket connector." This type of connector is designed to accommodate flexible metal conduits while providing an effective seal against environmental factors such as moisture and dust. The inclusion of a neoprene sealing gasket ensures that the connection is tight and prevents any ingress of unwanted materials, which is particularly important in environments where electrical equipment is exposed to varying conditions.

The STG connector is commonly used in industrial and commercial applications where durability and protection are essential. The neoprene gasket enhances the connector's performance by maintaining a reliable barrier against water and debris, thus extending the lifespan of the electrical system and ensuring safety.

Other options like standard connectors, metallic connectors, and non-metallic connectors lack the specific design feature of the neoprene sealing gasket, which is a distinguishing characteristic of the STG connector. Therefore, while they may serve their own purposes in different applications, they do not provide the same level of sealing and protection that the STG connector offers.