Conex adapter with loose nut, female thread 18 mm x 3/4" (P435501806000)

Conex adapter with loose nut, female thread 18 mm x 3/4" is a threaded transition fitting designed to join 18 mm metric pipe or tubing to a 3/4" imperial threaded component. The adapter features a removable nut that allows easy installation and tightening on-site, providing a mechanical connection suitable for plumbing and heating systems. It is intended for use where a reliable, leak-resistant joint is required between metric tubing and standard threaded fittings.

Advantages

The removable nut design simplifies assembly and replacement without the need to cut or rework existing pipe runs. Construction from corrosion-resistant materials ensures long-term dimensional stability and mechanical strength in typical residential and commercial plumbing environments. The female thread allows compatibility with standard 3/4" male threaded fittings, enabling straightforward integration into existing systems and repairs.

Suitable for

• Connecting 18 mm copper or plastic tubing to 3/4" threaded valves and fixtures
• Plumbing repairs and retrofits where metric-to-imperial transitions are required
• Heating system connections such as radiators, boilers, and manifold joins
• Site installations where a removable nut aids access and tightening

Key specifications

• Connection type: loose (removable) nut with female thread
• Metric side: 18 mm pipe/tubing connection
• Imperial side: 3/4" female threaded connection
• Intended applications: plumbing and heating system transitions
• Mechanical function: threaded, non-soldered transition fitting

How to use

Prepare the 18 mm pipe or tubing by ensuring clean, deburred ends and the correct insertion length. Slide the removable nut over the pipe, insert the pipe into the adapter body, and hand-tighten the nut onto the female thread. Use appropriate wrenches to secure the nut to the manufacturer’s recommended torque, taking care not to overtighten. Confirm thread engagement with the mating 3/4" male fitting and apply standard sealing method if required by the system (for example, appropriate tape or sealant on the male thread), then test the joint under working pressure for leaks.

Usage recommendations

Use the Conex adapter with compatible pipe material and dimensions; verify that the 18 mm tubing and the 3/4" threaded component are suitable for the system’s pressure and temperature. When working with potable water or pressurized heating systems, follow local regulations and best practices for sealing and testing threaded joints.