Abstract: A one piece extruded elastomeric support and retention liner gasket for resiliently and sealingly mounting a plastic sheet food liner to the cabinet in a refrigerator or freezer includes a barbed lower body which is pressed into an upwardly opening J-shaped channel formed adjacent the inner rim of the cabinet, the gasket including an intermediate inwardly projecting arm and a spaced resiliently supported upper head section defining with the arm an inwardly opening peripheral groove for receiving the outer peripheral flange of the food liner, the arrangement being such that as the gasket is pressed into the J-channel the arm engages the short leg of the J-channel so as to be upwardly deflected thereby narrowing the slot and the head section engages the long leg of the J-channel so as to downwardly deflect thereby also narrowing the slot whereby the flange is resiliently compressively gripped in assembly therebetween.