HPLC unions, adapters, and tubing connectors are used to join, split, adapt, and route fluidic pathways within liquid chromatography systems. These components support secure, low‑dead‑volume connections between tubing, columns, valves, and detectors across both low‑ and high‑pressure regions of the system.
This category includes a wide range of connection formats designed to accommodate different tubing sizes, materials, and connection standards, making them essential for system configuration, modification, maintenance, and OEM integration.
Unions for Tubing Connections
Unions are used to directly connect two sections of tubing or to join system components without changing tubing dimensions. Available formats include:
Straight unions for inline connections
Tee unions for three‑way flow paths
Cross unions for four‑way flow distribution
Unions are manufactured in multiple materials, including:
PEEK
Carbon‑filled PEEK (black)
Stainless steel
Material selection should be based on pressure requirements, solvent exposure, and whether bio‑inert or metal‑free flow paths are required.
Adapters for Tubing & Connection Interfaces
Adapters are used to transition between different tubing sizes, outer diameters (OD), inner diameters (ID), or connection styles. They allow laboratories to adapt existing systems without replacing full tubing runs or components.
Adapter configurations may be used to:
Connect tubing with different OD or ID
Transition between fitting styles (e.g., compression to barb or luer)
Reduce or expand flow paths as required by system design
Adapters are critical for maintaining flexibility in both analytical and development environments.
High‑Durability Unions for Demanding Applications
The Endure™ line of carbon‑filled PEEK unions is designed for enhanced durability in high‑pressure chromatography systems. Compared to standard PEEK fittings, Endure™ unions offer:
Improved resistance to over‑tightening
Greater tolerance to repeated solvent exposure
Higher durability under sustained pressure
These unions are particularly well suited for connecting PEEK tubing in applications where reliability and longevity are important.
Applications & Use Cases
Unions, adapters, and tubing connectors in this category are commonly used for:
System plumbing and reconfiguration
Connecting columns, guard columns, and detectors
Adapting tubing during method development
Replacing damaged or worn connections
OEM system design and fluidic sub‑assemblies
Proper selection of connectors helps maintain consistent flow paths, reduce dead volume, and support long‑term chromatographic performance.
System Integration & Standardization
Standardizing unions and adapters across instruments:
Simplifies maintenance and troubleshooting
Reduces setup variability between systems
Improves reproducibility when transferring methods
Supports efficient inventory and re‑ordering
For laboratories and OEMs managing multiple system configurations, consistent connection hardware is a key element of reliable operation.
Related Categories
HPLC Column Couplers (for linking analytical and guard columns)
HPLC Nuts, Ferrules & Fluidic Connection Components
Chromatography Tubing
👉 View HPLC column couplers for connecting analytical and guard columns
