Which part of a faucet is typically replaced in applications with heavy usage?

In applications with heavy usage, the component of a faucet that is commonly replaced is the wearing washer. This part experiences the most friction and wear over time due to the constant opening and closing of the faucet, which is especially prevalent in high-traffic environments like commercial kitchens or public restrooms.

While the body unit may eventually need to be replaced due to damage or corrosion, it's typically more durable and less subject to wear than the wearing washer. The stainless steel seat also can last a long time, as it is designed to withstand significant wear and corrosion. The ceramic control component, usually found in cartridge faucets, is made of durable materials and is less likely to be the first part to fail in high-usage scenarios. Therefore, regular maintenance often focuses on the wearing washer, which is crucial for maintaining proper function and preventing leaks.