Rusting overflow

Plumbing · Faucets · printed page 295 (PDF page 296)

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Faucets – Rusting Overflow

Text in the illustration

rust starts to develop where the overflow is spot welded to the basin
the rust can spread and ultimately eat through the basin (or overflow) causing leakage
the spot weld areas are also where (and why) enamel on the inside of the basin tends to chip
on newer enameled steel basins, the overflow is siliconed onto the basin
countertop
steel overflow channel
enameled steel basin
spot welds
outlet pipe (tailpiece)
viewed from below

Generated explanation

The illustration shows an enameled steel basin mounted in a countertop, viewed from below. A steel overflow channel follows the underside of the basin to the outlet pipe (tailpiece), with spot welds along its attachment flange. The annotations explain that rust can develop at these welds and eventually perforate the basin or overflow channel, causing leakage. They also identify the weld areas as locations where the interior enamel tends to chip and note that newer enameled steel basins use silicone to attach the overflow.