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A running toilet is not a plumbing emergency, but you will want to try some DIY fixes or call in a plumber to prevent wasting gallons of water. The three most common causes of a running toilet are a broken or dirty flapper, an incorrectly sized chain between the flush lever and flapper, or a float that is out of position.

While a toilet dripping on the outside can be caused by condensation, a toilet that is constantly dripping on the inside is usually caused by a deteriorated flapper. This is one of the most common types of toilet leaks. As the flapper degrades, it won’t seal properly, and water will constantly leak into the toilet.

The average cost to replace a toilet fill valve is around $100, and prices range from $50 up to $150, depending on your location, the experience of the plumber, and how accessible your toilet is. In most cases, a professional plumber can replace your fill valve in under an hour, although it might take longer if they also need to fix or replace other components at the same time.

Toilet seats have two mounting brackets on the back that accept mounting bolts. The bolts drop through the brackets, through two small holes on the top of your toilet, and then receive nuts to hold them in place on the bottom of the toilet. If you can’t see the bolt heads, you might need to pry up the mounting bracket cover, which is a plastic piece that hides and protects the bolts.