Pinpoint Specific Valve Failure and Prepare Replacement

What happens here

Upon closer examination of the internal valve system, the precise cause of the malfunction is identified: a small rubber sealing piece inside the valve is either missing or has severely deteriorated over time. This rubber component is crucial for forming a watertight seal that stops the water flow when the float rises. A new Miraco valve is retrieved, which includes this essential intact rubber sealing piece, confirming it as the correct replacement part.

Goal: Locate the exact point of failure within the valve and prepare the necessary replacement component.