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—Radiators for hot-water heating are most commonly of cast iron and in appearance are the same as those used for steam heating. The only difference in the two forms is in the openings between the sections. Those intended for steam have an opening at the bottom joining the sections; while those for hot water have openings at both top and bottom to permit circulation of the water.

Fig. 43.—The hot-water radiator valve.

Fig. 43a.—Details of construction of the hot-water radiator valve.