How Do Pedestal Sinks House the Plumbing?
Pedestal sinks so cleverly conceal their piping that many observers can't figure out where the water goes. Despite their freestanding appearance, pedestal sinks are tethered to the same plumbing components as standard bathroom sinks, including the hook-shaped, under-sink drain assembly called a "P-trap" and common, flexible supply lines. Does this Spark an idea?
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Drain Pipe Assembly
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Although pedestal sink columns appear solid, they are typically hollow from base to top. The sink basin's strainer protrudes into the hollow column and attaches to a standard P-trap. The P-trap attaches to a drain pipe extension and connects to the main drain line that protrudes from the bathroom's wall. The P-trap looks like the letter P flipped backward and turned 90 degrees counterclockwise. A P-trap's unusual shape traps water to create a pool that prevents sewer gases from reaching the plumbing fixture.
Faucet Plumbing
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Like a standard sink's water supply lines, a pedestal sink's supply lines connect to wall-mounted shutoff valves. The supply lines run from the shutoff valve to the rear, underside of the pedestal sink's basin and connect with the faucet's threaded stems.
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Installation Tips
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To conceal a pedestal sink's supply and drain lines fully, install the water shutoff valves and drain stub-out as close to the sink's basin as possible. Pedestal sink manufacturers include specific instructions for installation; these instructions are called "rough-in" specifications.
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References
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