Quickly and easily converts a smaller 5/16″ line size to a larger 3/8″ outlet line size.

John Guest enlarger push-fit fitting adapts a smaller 5/16″ line size to a larger 3/8″ outlet line size. Fast and simple to install, John Guest Air and Pneumatics creates an instant connection and airtight seal without the need for tools, hot works or sealing agents. Air piping systems can be set up and installed 50% quicker than traditional methods.

The unique collet locking design firmly and securely holds the pipe in place without deforming the pipe or restricting flow. Fittings are also fully demountable, reducing system downtime during maintenance and making it quick and easy to modify or extend systems.

Designed in tough engineered plastic, fittings are compatible with John Guest nylon, powder coated aluminium or LLDPE tubing, as well as copper, PEXa and other soft metal pipe materials. All John Guest fittings are manufactured and assembled in the UK.

Features and benefits

• Strong acetal copolymer fitting with nitrile O-Ring
• Airtight connection with superior flow characteristics
• Instant push-fit connection and demountable without tools
• Secure collet cover prevents accidental disconnection
• Suitable for air and pneumatics piping systems up to 10 bar
• Ideal for air, inert gases and vacuum applications
• Food grade fitting suitable for potable liquids
• Compatible with soft metal or plastic pipe/tubing

We offer a full range of John Guest and DuoTight fittings that enable you to create your own bespoke dispense system at home.

For more information on building a home dispense system be sure to check out our FAQ and Knowledge centre.

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