Abstract: An apparatus for maintaining the temperature of a fluid in a container includes a body having a cavity and a seal assembly adapted to engage and temporarily seal the container; a second fluid located and sealed in the cavity and having a freezing point below 0° C.; and the body and the seal assembly have no apertures through which the fluid or the second fluid flows.

Abstract: A device for a beverage container may include a tubular member that is insulated and has an axis. The tubular member may further include an upper axial end and a lower axial end. Both the upper and lower axial ends can be open. The tubular member may be configured to receive and insulate the beverage container therein. The device may include a base. The base may be removably coupled to the lower axial end of the tubular member to close the lower axial end. The base may include an interior compartment containing a fluid permanently sealed therein. The fluid can have a freezing point of about 0° C. or less.

Abstract: An apparatus for maintaining the temperature of a fluid in a container includes a body having a cavity and a seal assembly adapted to engage and temporarily seal the container; a second fluid located and sealed in the cavity and having a freezing point below 0° C.; and the body and the seal assembly have no apertures through which the fluid or the second fluid flows.