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HPLC tubing unions and flow distribution connectors are used to join, extend, or branch fluidic pathways within liquid chromatography systems. These components provide secure, low‑dead‑volume connections between tubing segments or system components without changing tubing size or connection style.

This category includes straight unions, tee connectors, and cross connectors used throughout HPLC systems for system assembly, modification, and maintenance.

Unions for Inline Tubing Connections

Straight unions are used to connect two sections of tubing in a continuous flow path. They are commonly used to:

  • Extend tubing length

  • Replace damaged sections

  • Join tubing during system reconfiguration

  • Connect system modules while maintaining consistent tubing dimensions

Unions allow modifications without replumbing entire flow paths.

Flow Distribution Connectors (Tees & Crosses)

Flow distribution connectors enable branching or combining flow paths, including:

  • Tee connectors (three‑way connections)

  • Cross connectors (four‑way connections)

These connectors are used in:

  • Multi‑stream solvent delivery

  • System splitting or merging

  • Method development and experimental setups

  • OEM and custom fluidic designs

Materials & Construction Options

Tubing unions and connectors are available in multiple materials to match system requirements:

  • PEEK, for bio‑inert and metal‑free applications

  • Carbon‑filled PEEK (black), offering increased durability and resistance to over‑tightening

  • Stainless steel, for high‑pressure and rugged environments

Material selection should consider pressure rating, solvent compatibility, and system location.

High‑Durability Unions for Demanding Applications

The Endure™ line of carbon‑filled PEEK unions is designed for extended service life in high‑pressure HPLC systems. Compared to standard PEEK connectors, Endure™ unions provide:

  • Greater resistance to solvent exposure

  • Improved tolerance to repeated tightening

  • Enhanced durability in long‑term use

They are particularly well suited for connecting PEEK tubing in systems where fittings are frequently serviced or reconfigured.

Applications & Use Cases

HPLC tubing unions and flow distribution connectors are commonly used for:

  • System plumbing and layout changes

  • Instrument maintenance and repair

  • Method development and prototyping

  • OEM system builds and sub‑assemblies

  • Connecting auxiliary components such as detectors or valves

Proper selection of unions and connectors helps maintain consistent flow paths and minimize dead volume.

Related Categories

  • HPLC Tubing Adapters (OD & ID Transitions)

  • HPLC Nuts, Ferrules & Fluidic Connection Components

  • HPLC Column Couplers (for linking analytical and guard columns)

👉 View HPLC column couplers for connecting analytical and guard columns

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