John Guest Coupling

• Product type: Equal straight push-fit coupling
• Manufacturer: John Guest
• Available sizes: 12mm to 28mm
• Body material: Acetal copolymer
• Seal material: Nitrile O-ring
• Maximum working pressure: Up to 10 bar
• Temperature range: -20°C to +70°C
• Connection method: Push-fit, demountable
• Compatible pipe materials: Nylon and powder-coated aluminium
• Application media: Compressed air, inert gases, vacuum and potable liquids
• Country of manufacture: United Kingdom

This straight coupling is designed to connect two equal-sized pipes quickly and securely within compressed air and pneumatic systems. The push-fit design allows pipes to be connected instantly without tools, hot works or sealing agents, significantly reducing installation time compared to traditional jointing methods.

A precision-engineered collet locking system grips the pipe firmly without deformation or flow restriction, while the integrated nitrile O-ring provides an airtight and reliable seal. The fitting is fully demountable, allowing systems to be modified, extended or maintained with minimal downtime.

Manufactured from tough engineered plastic, it is compatible with a wide range of pipe materials, including nylon and powder-coated aluminium air pipe. Suitable for air, inert gases, vacuum applications and potable liquids, it offers excellent versatility across industrial and workshop environments.

• Instant push-fit connection: Connects pipes quickly without tools, adhesives or heat
• Demountable design: Allows easy system changes and reduced maintenance downtime
• Secure collet locking system: Holds pipe firmly without damage or flow restriction
• Airtight sealing: Nitrile O-ring ensures reliable, leak-free performance
• Wide material compatibility: Suitable for plastic and soft metal pipework
• Multi-application use: Ideal for compressed air, inert gases, vacuum and potable liquids
• Made in the UK: Manufactured and assembled to consistently high quality standards

Installing a John Guest Straight Connector is straightforward and efficient. Follow these steps to ensure a secure and reliable connection:

1. Cutting the Pipe: Ensure the pipe is cut square for a proper fit. This is crucial for the integrity of the connection. Use a John Guest pipe cutter for rigid nylon pipes. For aluminium pipes, utilise aluminium pipe cutters. After cutting, remove any burrs or sharp edges to avoid damaging the O-Ring. This step is important to maintain the quality of the seal.
2. Making the Push-Fit Connection: Push the pipe firmly into the fitting up to the pipe stop. This ensures that the pipe is fully inserted for a secure connection. Make sure the pipe is aligned correctly with the fitting to avoid any leakage or fitting damage.
3. Checking the Connection: After inserting the pipe, pull it slightly to ensure the connection is secure. This test confirms that the fitting is properly engaged. Before using the system, conduct a thorough test to ensure there are no leaks and that all connections are secure.
4. Disconnecting the Fitting: Ensure the system is depressurised before attempting to disconnect. Push the collet towards the fitting to release the pipe. This step is crucial for a smooth disconnection. Carefully remove the pipe from the fitting.