Remove the tablet (it damages parts in the tank) and replace with 8300 Flush ‘n Sparkle Bleach Kit.

If you use chlorine tablets in the tank this would be the cause of the warping. If the flat rubber piece is warped then replace it.Makes sure the chain is not too straight. Cut excess chain if it is interfering with the seating of the flapper.Wipe slime and/or debris from the underside and flush valve seat with a clean cloth. If the flapper is less than 5 years old, check the rubber surface for debris.The time saved will outweigh the cost of fussing with an aged flapper. If the flapper is more than 5 years old, simply change it.The 5051 flapper is for a toilet manufactured after 1994. *Note: The Fluidmaster flappers # 503 and # 504 are for toilets manufactured before 1994. If the back half of the flapper has a gap between the rubber and the seat Fluidmaster recommends exchanging the flapper with our Flexible Frame Flapper models 503*, 504* or 5051*. If you are using a flapper pipe adaptor to hold your flapper to the flush valve turn the pipe adapter to the left or right to center the flapper over the drain hole.If there are any irregularities on the flush valve seat, you will need to replace or repair the flush valve. Move your finger around the seat rim to check for irregularities or nicks. Check the flush valve seat for corrosion or unevenness.*Note: The 5051 flapper is for a toilet manufactured after 1994. *Note: The Fluidmaster flappers # 503* and # 504* are for toilets manufactured before 1994. In this case, use an Flexible Frame models 503*, 504* and 5051*. Some flush valves that have oval overflow pipes or have an angled seat may not accommodate rigid frame flappers.If the pipe has pin holes or corrosion in this area, replace the brass overflow pipe. This is a potential leak location that can be tightened by turning it. Some brass overflow pipes are threaded at the bottom.If the back half of the flapper has a gap between the rubber and the seat Fluidmaster recommends exchanging the flapper with our Flexible Frame Flapper models ( 503, 504 or 5051). If your brass overflow pipe requires a flapper adapter ring to connect your flapper to the overflow pipe make sure the pipe adapter is square to the drain.If there are any irregularities on the flush valve seat, then you will need to replace the flush valve. Need a diagram of leak points within a toilet tank Need instructions on finding a slow leakĥ. This article will help you repair and find a leak in your tank.Ĥ.

Toilet overflow tube flap flush