What method of sealing a vault utilizes air pressure and epoxy material?

The method of sealing a vault that utilizes air pressure and epoxy material is known as the air seal. This sealing technique is designed to create a hermetic seal, preventing the ingress of moisture and other environmental elements that could compromise the integrity of the casket and the remains inside.

In the air seal method, a vacuum or air pressure is applied to the vault, and the epoxy material is used to create a watertight and airtight bond, ensuring that the vault is secure. This type of sealing is particularly important in maintaining the condition of the remains over time, as it helps to resist the effects of groundwater infiltration and various environmental pressures.

The other options, while related to burial and casket sealing methods, do not specifically describe the use of air pressure and epoxy in their sealing processes. A double seal, for example, typically refers to an additional layer of protection but does not involve air pressure in the same manner. Grave liners serve primarily as a protective cover over the casket, while unit pricing pertains to a pricing structure for funerary services rather than a sealing method.