If you have a pull-out or pull-down kitchen faucet, it likely uses a retractable hose for rinsing dishes, filling pots, or cleaning the sink.
To help that hose smoothly snap back into place instead of dangling loosely, manufacturers install a counterweight along the hose or at its base inside the cabinet.
That weight is often filled with small metal ball bearings or steel shot — the exact “mystery balls” you’re finding under your sink.
🔍 How It Happens🔍 How It Happens
Over time, due to: