explaining on Instagram: "A faucet, or tap, works on a simple principle: controlling water flow by adjusting the valve opening. Inside, a handle or lever operates a stem connected to a rubber or ceramic disc (washer). Turning the handle moves the stem, which lifts or lowers the washer, controlling water flow. When the washer lifts, water flows from the supply pipe, through the faucet, and out the spout. When the washer is seated, it blocks the flow, stopping the water. Modern faucets often use c