Thermwell Products Frost King VP57 Small Foundation Vent Plug, 5-1/2 in H, Polystyrene, White White $4.19EachMaterial: PolystyreneColor: WhiteHeight: 5-1/2 InDuct ShapeRectangularMaterialPolystyreneColorWhite +1 more Height5-1/2 In
Thermwell Products Frost King VP67 Large Foundation Vent Plug, 7-3/4 in H, Polystyrene, White White $4.89EachMaterial: PolystyreneColor: WhiteHeight: 7-3/4 InDuct ShapeRectangularMaterialPolystyreneColorWhite +1 more Height7-3/4 In
