A short section of pipe that connects a fixture drain to the trap, providing the essential link between the fixture outlet and the drainage system.

A tailpiece in plumbing is a short section of pipe that connects a fixture drain to the trap, providing the essential link between the fixture outlet and the drainage system while maintaining proper water flow and trap seal integrity. This fundamental plumbing component consists of a straight or angled pipe section that extends downward from the fixture drain opening to connect with the trap assembly, creating a watertight connection that allows waste water to flow from the fixture into the drainage system. Tailpieces are critical elements in plumbing systems where they ensure proper drainage function, maintain trap seals that prevent sewer gas infiltration, and provide accessible connections for maintenance and repair, making them essential components in residential and commercial plumbing installations.

Tailpieces are utilized in various plumbing fixture applications including kitchen sinks where they connect sink drains to P-traps and provide connections for garbage disposals and dishwashers, bathroom sinks where they link lavatory drains to trap assemblies while accommodating pop-up drain mechanisms, bathtubs where they connect tub drains to trap systems and overflow assemblies, shower drains where they provide connections between shower bases and drainage systems, utility sinks and laundry tubs where they handle various drainage requirements, and commercial fixtures including floor drains, service sinks, and specialty equipment where tailpieces accommodate specific drainage needs. Each application requires appropriate tailpiece sizing, materials, and configuration based on fixture type and drainage requirements.

The design and construction characteristics of tailpieces include material options such as PVC, ABS, brass, or chrome-plated metal chosen for durability and compatibility with fixture and trap materials, standard diameters typically 1-1/4 inch or 1-1/2 inch to match common fixture drain sizes, length variations that accommodate different installation requirements and fixture heights, connection methods including slip joints, threaded connections, or solvent-welded joints depending on system requirements, wall thickness specifications that provide adequate strength while maintaining proper flow characteristics, and surface finishes that may be visible or concealed depending on installation location. Quality construction ensures reliable performance and longevity.

Fun Fact: The term “tailpiece” comes from its position as the “tail” end of the fixture drain assembly, and standardized tailpiece dimensions were established in the early 20th century to ensure compatibility between different manufacturers’ fixtures and traps.

• Nipple (Plumbing)
• Offset (Plumbing)
• Saddle (Roof or Plumbing)