Straight Coupling with Half-Nut Herz P702081 20x2 to G3/4 Cone Seal

Straight coupling Herz P702081 20x2 to G3/4 Cone Seal is a mechanical connector designed to join a 20x2 metric copper or multilayer pipe to a G3/4 threaded fitting. The coupling uses a half-nut clamping design and a conical (cone) seal to provide a pressure-tight connection suitable for plumbing and heating systems. It is intended for applications requiring a reliable transition from pipe outer dimensions to the G3/4 standard thread while maintaining leak-free performance under typical domestic and light commercial operating conditions.

Advantages

The half-nut design allows straightforward assembly and secure mechanical grip on the pipe without the need for soldering. The cone seal provides a tight, pressure-resistant joint that reduces the risk of leaks at the thread interface. Compact straight form factor keeps the connection line neat and minimizes space requirements. Manufactured by Herz, the coupling is compatible with common 20x2 pipes and standard G3/4 fittings used in heating and plumbing works.

Suitable for

• Connecting 20x2 copper or multilayer pipes to G3/4 threaded valves and fittings
• Domestic and light commercial heating system installations
• Plumbing repairs and retrofits that require metric-to-G3/4 transitions
• Points where a pressure-tight mechanical joint is preferred over soldering or adhesive methods

Key specifications

• Connection type: straight coupling with half-nut and cone seal
• Pipe compatibility: 20x2 (outer diameter 20 mm, wall thickness 2 mm)
• Threaded side: G3/4 standard thread
• Seal type: conical (cone) pressure seal
• Typical applications: plumbing and heating installations

How to use

Prepare the pipe end by cutting square and deburring to ensure proper seating. Slide the coupling half-nut over the pipe, position the cone seal against the pipe end and screw the coupling onto the G3/4 fitting by hand to start. Tighten the half-nut to the specified torque using appropriate tools until the cone seal engages and creates a pressure-tight joint. Verify alignment and check for leaks under system pressure before completing installation. Follow any system-specific guidelines for torque and installation clearances.

Usage recommendations

Use with clean, undamaged pipe ends and compatible G3/4 fittings. Do not overtighten beyond recommended torque to avoid deforming the cone seal or pipe. Inspect the joint after initial pressurization and periodically during system commissioning to ensure long-term integrity.