A Ballcock Washer is a small, yet essential component in a toilet or water tank's ballcock mechanism. It creates a watertight seal inside the valve, ensuring smooth water flow and preventing leaks. Over time, the washer can wear out, leading to dripping or continuous water flow, so it's important to replace it when needed.
This washer is commonly used in toilet cisterns and cold water tanks to maintain proper water control and prevent water waste.