Abstract: A closure adaptable for protecting an electric plug extending from a vehicle, which comprises a box-like structure having first and second complementary members hingedly connected and interface with each other when the closure is in a closed condition. A recess in a marginal edge of at least one side wall of said member forms an opening along the interface of said first and second members when in closed condition to permit electric wires to extend from said plug outwardly from said closure. A closed cell, cellular polymer is encased in each of said first and second members, (i) said polymer being substantially moisture resistant and compressible, (ii) and said polymer having a combined volume sufficient relative to the combined, interior volume of said closure to permit said first and second members to close when brought into abutting relationship and to substantially envelop said plug thereby forming a water-tight seal.