ENHANCED DURABILITY - Constructed from robust materials, the Ikelite Low Profile Port Lock ensures long-lasting performance and protection for your underwater photography equipment. SECURE ATTACHMENT - Provides a reliable and tight connection between your 8' dome port (models 5510.82 & 5510.10) and your Ikelite housing, preventing accidental detachment. STREAMLINED DESIGN - The low-profile design minimizes bulk and drag in the water, improving maneuverability and reducing resistance during underwater photography sessions. EASY INSTALLATION - Quickly and easily attach or detach your dome port with the user-friendly locking mechanism, saving you time and effort when setting up your gear.