Smc Pneumatics KQ2L04-00A Push-to-connect Union Fitting

Product Description

The SMC PNEUMATICS KQ2L04-00A is a push-to-connect union tube fitting designed for quick, tool-free tubing connections in pneumatic and fluid-handling systems. Built with a brass body and polybutylene tubing compatibility, it accepts 4mm outside-diameter tubing and is rated to 145 psi maximum working pressure. The union configuration allows two tube ends to join inline without threaded adapters or ferrules. HVAC technicians, pneumatic system installers, and plumbing professionals use this fitting where fast, reliable tube connections are required in light-duty compressed-air or fluid lines.

This fitting is suited for residential and light commercial pneumatic control lines, instrument air tubing runs, and low-pressure fluid distribution systems operating within a temperature range of 23 degrees F to 140 degrees F. The push-to-connect design reduces installation time and allows for disconnection and reconnection without special tooling, making it practical for panel-build, OEM assembly, and field-service applications where tubing must be routed or rerouted quickly.

Key Features

• Push-to-connect design allows tool-free tube insertion and secure retention
• Brass body construction provides corrosion resistance and durability in pneumatic service
• Compatible with 4mm outside-diameter polybutylene tubing
• Rated to 145 psi maximum working pressure
• Operating temperature range of 23 degrees F to 140 degrees F suits indoor and controlled-environment installations
• RoHS compliant materials

Compatibility

Designed as an OEM-style push-to-connect union fitting for pneumatic tubing systems using 4mm outside-diameter polybutylene tubing rated for pressures up to 145 psi.

Installation Notes

Installation is performed by pneumatic system technicians or qualified plumbing and instrumentation professionals. Depressurize and isolate the line completely before inserting or removing tubing. Ensure tubing ends are cut square and deburred before insertion to achieve a proper seal and prevent premature wear on the internal collet. Do not exceed the rated working pressure or temperature limits marked on the fitting.