Push-Fit Fittings

John Guest push-fit fittings are a trusted solution for compressed air and pneumatic systems where speed, reliability and flexibility matter. Designed for tool-free installation, these fittings create secure, airtight connections without hot works, adhesives or specialist equipment - ideal for workshops, factories and air ring main installations.

Manufactured from high-quality acetal copolymer, John Guest air fittings are lightweight, corrosion-resistant and engineered for long service life. The precision collet and O-ring sealing system grips the pipe firmly without deformation or flow restriction, ensuring dependable performance across demanding industrial environments.

Available in a wide range of straight couplings, elbows, tees, reducers, adaptors, end stops and specialist components, the system allows pipework to be installed, modified or extended with minimal downtime. Sizes from 12mm to 22mm use a standard push-fit design, while 28mm fittings feature a twist-and-lock mechanism for added security.

Suitable for compressed air up to 10 bar, as well as inert gases, vacuum and potable liquids, John Guest fittings are compatible with nylon and powder-coated aluminium pipe and are manufactured and assembled in the UK to consistently high standards

• Depressurise the system
  • Always ensure the system is fully depressurised before disconnection.
• Release the collet
  • Push the collet squarely towards the fitting body.
• Remove the pipe
  • While holding the collet in, pull the pipe out smoothly.
• Unlock (28mm fittings only)
  • Rotate the locking cap ¼ turn back, then push the collet and remove the pipe.

Fittings are fully reusable, making system changes and maintenance quick and cost-effective.

Yes - push-fit fittings are highly reliable when they’re used with the correct pipe, installed properly, and operated within their rated limits.

That reliability comes down to a few key design points:

• Positive mechanical grip: The internal collet grips the pipe firmly, holding it in place without crushing or restricting flow.
• Airtight sealing: An internal O-ring creates the seal once the pipe is inserted fully to the pipe stop.
• Consistency: Because the connection method is repeatable (cut square, deburr, push to stop, pull-test), you get far fewer “installer variables” compared with some traditional jointing methods.
• Demountable and reusable: Being able to disconnect and reconfigure without damaging components makes maintenance easier - as long as the pipe ends are still in good condition.

To keep push-fit fittings dependable long-term, the biggest factors are:

• Pipe prep: Cut the pipe square and remove burrs/sharp edges (prevents O-ring damage).
• Correct pipe type: Use compatible pipe.
• Full insertion: Always push the pipe fully home to the pipe stop, then pull to check.
• System conditions: Stay within the stated pressure and temperature ratings, and avoid unnecessary strain, vibration or side-loading on the joint (use proper clipping/support).
• Routine checks: A quick visual inspection as part of regular maintenance is sensible, especially in harsher environments.