Freeze-proof cap for outdoor faucet

A thermally insulated cap for protecting the outdoor faucets and the like from freezing and to reduce the heat leakage from a building through the space between a wall and a pipe line, comprising a thermally insulated cap section and a face plate providing means for rigidly mounting the said cap to an existing outdoor faucet adjacent to a wall, the cap integral formed with a rigid shell, preferably of hemi-spherical in shape, being made of PVC or plastic type of material with its inner surface thermally insulated using a layer of fiberglass or styrofoam, at the opening end of the said cap, a ring shape flange on which a layer of sponge rubber glued along the edge facing the face plate providing a means for perfectly shielding the faucet when the said cap being mounted on the face plate by two adapting screws provided on the flange, the mounting face plate having a cylindrical shape and being divided into half cylindrical plates with its center having a concentric cylindrical recess with a layer of sponge rubber glued around, with two screws passing thru two apertured lugs adapted to draw said plates together yielding means for fastening the said plates to the neck of faucet without dismantling any part of existing faucet, a ring type of rubber sponge glued around the edge of plates on the side facing to a wall to minimizing the heat loss thru the space between the plate and the wall.