What is found on the foot panel header of a half-couch casket that creates an airtight seal?

The gasket channel is a crucial component located on the foot panel header of a half-couch casket, designed to create an airtight seal. This channel houses a gasket, which is typically made from rubber or a similar material, ensuring a tight closure when the casket is closed. The function of the gasket channel is vital for preserving the contents within the casket, as it minimizes the intrusion of outside elements and helps maintain a controlled environment for the deceased.

While other options may refer to different parts or features of the casket, they do not specifically serve the purpose of creating an airtight seal. For instance, the locking mechanism is meant more for security and closure rather than ensuring airtightness. The foot panel is simply a component of the casket and does not have a sealing function. The rolled edge also refers to a design feature, enhancing aesthetics and sometimes structural integrity, but it does not provide the functional sealing ability of the gasket channel. Thus, the gasket channel is the correct and essential answer regarding the creation of an airtight seal in a half-couch casket.