A container refrigeration unit, comprising: a container comprising sidewalls defining an open end and a curtain track proximate the open end; a curtain sized to cover the open end; a seal element; and a sealing adapter fitted to the curtain track, wherein an entire periphery of the curtain and an entirety of the seal element are sequentially fitted to the sealing adapter; wherein the sealing adapter comprises: a first flange comprising a first surface and a first interior face; a second flange comprising a second surface and a second interior face opposite and at a distance from the first interior face; and a body comprising compliant material integrally connected with the first and second flanges, the body comprising: a first side defining a cavity which extends from the first interior face to the second interior face; and a second side opposite the first side and comprising a male insert section extending from the first surface, a female insert section extending from the second surface and an additional section extending between the male and female insert sections (5320,5321); wherein: the first surface is abutted with a first side of the curtain track, the second surface is abutted with a second side of the curtain track, and the second side of the body conforms to an interior topography of the curtain track. a container comprising sidewalls defining an open end and a curtain track proximate the open end; a curtain sized to cover the open end; a seal element; and a sealing adapter fitted to the curtain track, wherein an entire periphery of the curtain and an entirety of the seal element are sequentially fitted to the sealing adapter; wherein the sealing adapter comprises: a first flange comprising a first surface and a first interior face; a second flange comprising a second surface and a second interior face opposite and at a distance from the first interior face; and a body comprising compliant material integrally connected with the first and second flanges, the body comprising: a first side defining a cavity which extends from the first interior face to the second interior face; and a second side opposite the first side and comprising a male insert section extending from the first surface, a female insert section extending from the second surface and an additional section extending between the male and female insert sections (5320,5321); wherein: the first surface is abutted with a first side of the curtain track, the second surface is abutted with a second side of the curtain track, and the second side of the body conforms to an interior topography of the curtain track. a first flange comprising a first surface and a first interior face; a second flange comprising a second surface and a second interior face opposite and at a distance from the first interior face; and a body comprising compliant material integrally connected with the first and second flanges, the body comprising: a first side defining a cavity which extends from the first interior face to the second interior face; and a second side opposite the first side and comprising a male insert section extending from the first surface, a female insert section extending from the second surface and an additional section extending between the male and female insert sections (5320,5321); wherein: the first surface is abutted with a first side of the curtain track, the second surface is abutted with a second side of the curtain track, and the second side of the body conforms to an interior topography of the curtain track. a first side defining a cavity which extends from the first interior face to the second interior face; and a second side opposite the first side and comprising a male insert section extending from the first surface, a female insert section extending from the second surface and an additional section extending between the male and female insert sections (5320,5321); wherein: the first surface is abutted with a first side of the curtain track, the second surface is abutted with a second side of the curtain track, and the second side of the body conforms to an interior topography of the curtain track. the first surface is abutted with a first side of the curtain track, the second surface is abutted with a second side of the curtain track, and the second side of the body conforms to an interior topography of the curtain track.