Which plumbing fixture is most likely to develop leaks over time?

Toilets are particularly susceptible to leaks over time due to several factors related to their design and function. First, a toilet consists of various components, including the tank, bowl, flapper, and fill valve. Over time, wear and tear on these components can lead to failures, such as a worn flapper that fails to create a proper seal, which can cause the toilet to run continuously or leak water into the bowl.

Additionally, the connections between the tank and the bowl, as well as the supply line and fill valve, can develop leaks due to the natural aging of materials and repeated cycles of expansion and contraction. Furthermore, toilets are often exposed to constant water pressure, which can contribute to the degradation of seals over time.

While bathtubs, sinks, and showerheads can also develop leaks, the complexity of a toilet's mechanisms and the consistent operation of water make it more prone to leaking issues, particularly in older models or those that have not been maintained properly. Therefore, the toilet stands out as the plumbing fixture most likely to experience leaks over time.