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Safety Caps For Chimneys Proudly Made In The U.S.A. Safety Caps for chimneys provide protection against dangerous sparks while reducing downdrafts, clogging, soot, and creosote build-up. They also protect against animal and bird infestation, and deflect other debris and rain from entering the chimney. All Master Flow ® Safety Caps feature: • Superior Design... Single piece, heavy gauge hood for longer life and less chance for leaks • Long-Lasting Construction...