Smc Pneumatics KCU04-00 Union Y Tube Fitting 4mm

Product Description

The SMC PNEUMATICS KCU04-00 is a push-to-connect union Y tube fitting designed for pneumatic tubing systems requiring a three-way branch connection. Constructed from polybutylene, this fitting accepts tubing with a 4 mm outside diameter and is rated for use up to 145 psi. Installation requires no tools - tubing inserts and locks in place with a simple push, enabling fast assembly and modification of pneumatic circuits. Pneumatic technicians and maintenance professionals install this fitting when routing compressed air lines through equipment or machinery.

This fitting is suited for light-duty pneumatic circuit work in industrial and automation environments where compact, low-profile connections are needed. The Y configuration allows a single supply line to branch into two outputs, making it useful in manifold arrangements, instrument air lines, and small-bore pneumatic control systems. Its polybutylene construction makes it appropriate for dry compressed air and general-purpose pneumatic media.

Key Features

• Push-to-connect design allows tool-free tube insertion and removal
• Union Y configuration splits one inlet into two outlet ports
• Rated to 145 psi for standard pneumatic circuit pressures
• Polybutylene construction offers good chemical compatibility for pneumatic air service
• Compact form factor suits tight routing in automation and equipment panels

Compatibility

Designed as an OEM-style push-to-connect fitting for pneumatic tubing systems using 4 mm outside diameter tubing.

Installation Notes

Depressurize and lock out the pneumatic circuit before installing or removing any fittings. Ensure tubing is cut cleanly and squarely with no burrs before insertion to achieve a proper seal. Verify tubing outside diameter matches the fitting specification prior to assembly. This type of fitting is typically installed by pneumatic system technicians following applicable equipment manufacturer guidelines.