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What is a Plumbing Outlet Box?

Published in Plumbing Components 3 mins read

A plumbing outlet box, often referred to as a supply box, is a fixture specifically designed to connect appliances to your home water-supply lines. It serves as a convenient and accessible point within the wall for plumbing connections.

Based on common descriptions and the provided reference, here's a breakdown of what a plumbing outlet box entails:

Function and Purpose

The primary role of a plumbing outlet box is to provide a secure and readily accessible connection point for water supply lines (and sometimes drain lines) behind the wall, typically where an appliance or fixture will be located.

  • Appliance Connection: It facilitates the hookup of water-using appliances like washing machines, ice makers, or dishwashers directly to the household plumbing system.
  • Accessibility: By housing the connections within a box set flush with the wall, it allows for easy shut-off, maintenance, or disconnection without needing to access plumbing within the wall cavity.

Physical Characteristics

As described, a plumbing outlet box has distinct physical attributes:

  • Material: It is typically constructed from metal or plastic.
  • Mounting: Its box mount is set flush with the exterior of a finished wall. This design ensures it doesn't protrude and can be easily covered by a faceplate, blending with the wall surface.
  • Access: The flush mount design is crucial to allow easy access to your water supply and/or drain.

Key Features and Benefits

Using a plumbing outlet box offers several advantages:

  • Clean Installation: Provides a neat, organized point for connections within the wall.
  • Easy Maintenance: Shut-off valves, often located inside the box, are simple to reach and operate.
  • Safety: Reduces the risk of pipes being accidentally damaged within the wall.
  • Compliance: Many building codes require the use of such boxes for specific appliance connections.
  • Variety: Available for various applications, including single-fixture supply, dual-fixture supply, and combinations of supply and drain connections.
Feature Description
Purpose Connects appliances to water supply lines
Location Set flush within a finished wall
Material Metal or Plastic
Benefit Allows easy access to water supply and/or drain
Common Use Washing machines, ice makers, dishwashers

In summary, a plumbing outlet box is a standard plumbing component that provides a safe, accessible, and clean way to connect water supply (and sometimes drain) lines from the wall to household appliances.

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