Understanding the Relationship Between the Sink and a Wall Mounted Faucet

A wall mounted faucet is installed directly into the wall, not the sink. Because of this design, almost nothing from the faucet assembly physically passes through the sink itself. Instead, the sink serves only as the basin that receives the water, while all functional components of the faucet system stay within or behind the wall. This makes wall mounted faucets different from deck mounted faucets, which require holes drilled into the sink or countertop for water lines and mounting hardware.

No Faucet Holes Required in the Sink

Since the faucet is attached to the wall, the sink does not need any holes for the faucet body, supply lines, or mounting bolts. This allows greater flexibility when choosing sink styles, including vessel sinks, standalone bowls, and custom designs with no pre-drilled holes. Installers simply place the sink below the faucet’s spout projection, ensuring the water stream lands correctly in the center of the basin.

Only Drain Components Pass Through the Sink

The only items that must pass through the sink for wall mounted faucet setups are drainage components. These include:

• The drain opening

• The drain flange and stopper

• The tailpiece connecting to the trap
  All water supply lines for the faucet remain inside the wall, while drainage runs downward beneath the sink as in any standard installation.

Overflow and Accessory Considerations

If the sink has a built-in overflow, an overflow channel is also part of what passes through the sink structure. This system connects the overflow hole to the main drain opening. However, this is unrelated to the faucet itself and applies to both wall mounted and deck mounted setups.

Additional accessories like soap dispensers or sprayers do not pass through the sink unless specifically installed. Since wall mounted faucets eliminate the need for faucet holes, the sink’s surface remains clean and uncluttered unless additional holes are intentionally added for accessories.

Plumbing Lines Stay Inside the Wall

For wall mounted faucets, the hot and cold water lines come through the wall only. They do not pass through the sink or countertop. To prepare for installation, the wall must contain:

• The supply pipes at the correct height

• Proper center-to-center spacing

• Reinforcement behind the wall to support the valve body
  Because none of these plumbing components pass through the sink, the fixture is visually streamlined and leaves more counter or basin space available.

When a Sink May Need Custom Openings

Although uncommon, a sink may require openings if additional features are installed, such as:

• Soap dispensers

• Filtration system outlets

• Accessory sprayers

These openings are optional and unrelated to the faucet installation. The faucet itself still remains fully wall-mounted, with no parts penetrating the sink.

Summary

For wall mounted faucets, nothing from the faucet assembly passes through the sink. The only required openings in the sink are for the drain system, while all supply lines and mounting components remain inside the wall. This design provides a clean, modern look and makes the sink selection more flexible since no faucet holes are needed.