Pipe coupling (sliding) SANHA SANHA-THERM C-Stahl d18, model 124270S18

The Pipe coupling (sliding) SANHA SANHA-THERM C-Stahl d18 is a mechanical connector designed to join 18 mm steel pipes in hydronic heating and plumbing systems. Built for installations where axial movement or thermal expansion must be accommodated, this sliding coupling provides a compact, push-fit style connection that preserves pipe alignment while allowing controlled longitudinal movement.

Advantages

This sliding coupling offers a space-saving design compatible with 18 mm steel pipe runs and supports thermal expansion without stressing adjacent fittings. The push-fit connection simplifies installation by reducing the need for soldering or threaded joints, and the construction is made to suit routine heating and plumbing use. The coupling maintains a sealed connection while permitting axial movement, which helps prevent pipe distortion and reduces stress on fixed anchors and fixtures.

Suitable for

• Joining 18 mm steel pipes in domestic or commercial hydronic heating systems
• Applications that require compensation for thermal expansion or contraction
• Sections of piping where limited axial movement is needed to protect fixed components
• Retrofit or replacement work where a compact, push-fit sliding connector is preferred

When it may not be suitable

This sliding coupling is intended for 18 mm steel pipes and may not be suitable for pipes of other materials or diameters without compatible adapters. It is not intended to replace flexible hoses or expansion joints in systems that require large movement amplitudes or vibration isolation beyond axial sliding.

Key specifications

• Pipe diameter compatibility: 18 mm
• Function: sliding (axial movement) coupling for thermal expansion compensation
• Application: hydronic heating and plumbing systems
• Connection type: push-fit style mechanical coupling
• Material family: steel coupling for steel piping systems

How to use

Prepare and deburr the ends of the steel pipes to ensure smooth insertion. Slide the coupling onto the pipe ends as specified by the manufacturer's fitment instructions, ensuring correct alignment and engagement depth for a sealed connection. After installation, check that the coupling can move axially as intended and that any pipe anchors or supports allow the required movement. Perform a pressure or leak test according to local codes and system requirements before putting the system into regular service.

What to consider before purchase

• Confirm the pipe outer diameter is 18 mm and that the pipes are compatible steel material
• Verify the required axial movement range and whether a sliding coupling meets system needs
• Ensure installation access and clearances are sufficient for push-fit assembly
• Check system pressure and temperature limits to confirm suitability for hydronic use

Usage recommendations

Use this sliding coupling in straight runs where limited axial compensation is needed; combine with appropriate fixed anchors and guides to control movement. Follow local installation standards and the manufacturer's assembly instructions to ensure a secure, leak-free connection.