Smc Pneumatics KCJ04-99 Check Adapter Fitting 145 Psi

Product Description

The SMC PNEUMATICS KCJ04-99 is a push-to-connect check adapter fitting designed for use in pneumatic tubing systems. It allows tubing to connect quickly without tools while permitting flow in one direction only, preventing backflow. Constructed from brass with a polybutylene tube interface, it is rated for a maximum working pressure of 145 psi. The fitting accepts tubing with a 4 mm outside diameter and has an overall length of 49.5 mm (approximately 1.95 inches). It is installed by pneumatic technicians and fluid system assemblers working on compressed air or low-pressure fluid circuits.

This check adapter is suited for light industrial and commercial pneumatic applications where a reliable, tool-free tube connection with integrated check function is needed. Typical install scenarios include instrument air lines, automation equipment, and pneumatic control circuits using 4 mm OD polybutylene or compatible tubing. The compact body fits in tight panel or manifold layouts where space is limited.

Key Features

• Push-to-connect design allows fast, tool-free tube insertion and removal
• Integrated check function prevents reverse flow through the fitting
• Brass body construction for durability in pneumatic service
• Rated to 145 psi maximum working pressure
• Accepts 4 mm outside diameter tubing
• RoHS compliant

Compatibility

Designed as an OEM-style push-to-connect check adapter for pneumatic systems using 4 mm OD tubing operating within a 145 psi pressure rating.

Installation Notes

Installation is performed by qualified pneumatic or instrumentation technicians. Depressurize and isolate the pneumatic circuit completely before installing or removing this fitting. Ensure the tube end is cut cleanly and squarely to the correct length before insertion to achieve a proper seal. Verify that system operating pressure does not exceed the 145 psi rated maximum working pressure of this fitting.