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If your Mansfield 160 is turning on and shutting off randomly this is due to a leak in the tank. If water isn't leaking onto the floor then the issue is either a flush valve seal, or a flapper. If you have the tower style flush valve, you would need the 630-0030 flush valve seal. If your tank has a flapper in it, then it can be one of two flappers. If your flapper is a two inch flapper, then the replacement is the 630-0173 flapper. The other flapper is a 3 inch flapper and its replacement part is the 630-0207 3 inch flapper.
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