How to Replace a Cracked or Deteriorated Flap Valve. Use a universal 2-inch toilet flush valve repair kit, which costs $10 to 15 and usually includes a toilet flapper, seal, sealant, and chain ...

You can do this by inspecting the flapper currently inside your tank — it's the rubber piece covering the flush valve opening (the hole where water rushes into the bowl).

You need to replace the fill valve and/or the flapper. The toilet is running because either water is running in the toilet or water is running out. VIEW E-EDITION ...