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b. Water line connection is loose or not seated properly. c. Defective water valve. d. Stripped threads. a. Replace water valve. b. Insure that threads are not cross- threaded and tighten. c. Replace water valve. d. Replace water valve. 8. Water leaking from rear of toilet bowl. a. Worn or defective vacuum breaker. b. Loose vacuum breaker. c. Cracked or defective toilet bowl. a. Remove white cap from vacuum breaker. Flush toilet. If water leaks during flush, vacuum breaker needs to be replaced.