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The metal breakable caps for fire department connections are cast aluminum. Each set includes two caps and four eyelets with nuts for 2-1/2 in swivels. The caps have been molded with "scored" tabs for easy removal with a hydrant wrench or other similar tool. Metal breakable caps provide inexpensive protection against the introduction of foreign material into the swivels but allow for quick access when a hose connection is necessary.
FPPI® 4380003100 Breakable Cap, 2-1/2 in Fitting Connection, Polystyrene