Compression/Butt Fusion Fitting SiGMA-Li PERTMR2016T — PE-RT polyethylene sleeve 20×16 mm

SiGMA-Li PERTMR2016T — PE-RT polyethylene sleeve 20×16 mm is a welded/press transition fitting designed for connecting PE-RT pipes where a reduction from 20 mm to 16 mm is required. The fitting is produced from PE-RT (polyethylene of raised temperature resistance) and provides a combined mechanical and thermoplastic joint suitable for potable water and underfloor heating systems. Its sleeve-style design enables branch or reducer connections in systems that use press or fusion installation methods.

Advantages

The fitting combines the heat-resistant properties of PE-RT with a sleeve construction that supports both welding and pressing installation techniques, resulting in reliable, leak-resistant joints. Its compact reducer profile minimises space requirements in manifolds and tight installation zones. Made from a material suitable for hot water distribution, the fitting maintains dimensional stability under operational temperatures typical for heating and plumbing systems.

Suitable for

• Transition connections from 20 mm to 16 mm PE-RT pipes
• Branching and reducing points in potable water distribution
• Underfloor heating manifold and branch installations
• Repairs or retrofits where a compact reducer sleeve is required

Key specifications

• Material: PE-RT (polyethylene of raised temperature resistance)
• Connection type: sleeve for welded or press joining
• Pipe sizes: 20 mm to 16 mm transition
• Application: potable water and heating systems, including underfloor heating
• Design: compact reducer/sleeve for branch or reducing connections

How to use

Select the appropriate installation method for the system — welding (butt or electrofusion where applicable) or compatible press tooling. Prepare pipe ends by cutting square and deburring; ensure pipe outer diameters and wall thickness match PE-RT specifications. Insert the smaller pipe end into the sleeve for the 16 mm side and the 20 mm pipe into the larger end, following the chosen joining procedure and the tool manufacturer's instructions. Allow any thermoplastic welds to cool and any press fittings to set before returning the system to service. Verify joints visually and by pressure testing according to project requirements and local regulations.

Usage recommendations

Use SiGMA-Li PE-RT sleeve fittings only with compatible PE-RT pipe and certified installation tools. Adhere to recommended temperature and pressure limits for PE-RT systems, follow local plumbing codes, and perform pressure tests after installation to confirm tightness. For best results in underfloor heating, place reducer fittings in accessible positions for maintenance and inspection.