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
