What role does a door gasket serve on a container?

A door gasket plays a crucial role in ensuring that a container remains watertight and secure when closed. This component is typically made of rubber or another flexible material and is strategically attached to the edges of the doors. When the doors are closed, the gasket compresses, creating a seal that prevents water, dust, and other environmental elements from entering the container. This is particularly important for cargo safety, as it protects the contents from moisture and contamination, which could lead to damage or spoilage.

The other options, while they describe features that may be present in containers, do not accurately define the primary function of the door gasket. The gasket's main purpose is focused on maintaining a seal for waterproofing, rather than temperature control, security locking mechanisms, or aesthetic enhancements.