You will be better off to just replace the fill valve all you have to do is turn off the angle stop ,that is the water valve that goes to to your tank then loosen the top of the supply line when its disconnected take the nut off that connects to the threaded part at bottom of toilet tank then just pull it out of tank and replace
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You will be better off to just replace the fill valve all you have to do is turn off the angle stop ,that is the water valve that goes to to your tank then loosen the top of the supply line when its disconnected take the nut off that connects to the threaded part at bottom of toilet tank then just pull it out of tank and replace