PE-RT II Electrofusion Reducing Coupler

PE-RT II electrofusion reducing coupler is designed to connect two compatible PE-RT II pipes with different outside diameters through electrofusion welding. It provides a straight size transition while maintaining a welded PE-RT II pipeline connection.

All Models & Specifications

Available PE-RT II electrofusion reducing coupler models are grouped by SDR / PN for faster size selection.

SDR11 / PN16

Size (mm)
25 × 20
32 × 20
32 × 25
40 × 20
40 × 25
40 × 32
50 × 20
50 × 25
50 × 32
50 × 40
63 × 32
63 × 40
63 × 50
75 × 32
75 × 40
75 × 50
75 × 63
90 × 40
90 × 50
90 × 63
90 × 75
110 × 40
110 × 50
110 × 63
110 × 75
110 × 90
125 × 50
125 × 63
125 × 75
125 × 90
125 × 110
140 × 50
140 × 63
140 × 75
140 × 90
140 × 110
140 × 125
160 × 50
160 × 63
160 × 75
160 × 90
160 × 110
160 × 125
160 × 140
180 × 110
180 × 125
180 × 140
180 × 160
200 × 50
200 × 63
200 × 75
200 × 90
200 × 110
200 × 125
200 × 140
200 × 160
200 × 180
225 × 110
225 × 125
225 × 140
225 × 160
225 × 180
225 × 200
250 × 110
250 × 125
250 × 160
250 × 200
250 × 225
280 × 250
280 × 225
280 × 200
280 × 160
280 × 125
280 × 110
315 × 110
315 × 125
315 × 160
315 × 200
315 × 225
315 × 250
315 × 280
355 × 125
355 × 160
355 × 200
355 × 225
355 × 250
355 × 315
400 × 110
400 × 125
400 × 160
400 × 200
400 × 225
400 × 250
400 × 315
400 × 355
450 × 315
450 × 400
500 × 315
500 × 400
630 × 400
630 × 500

SDR17 / PN10

Size (mm)
355 × 200
355 × 250
355 × 315
400 × 250
400 × 315

About PE-RT II Electrofusion Reducing Coupler

PE-RT II electrofusion reducing coupler is used for straight-line connection between two different PE-RT II pipe diameters. Unlike an equal coupler, it allows the pipeline to change size while remaining on the same center line.

The fitting contains integrated electrofusion heating elements. During installation, the prepared pipe ends are inserted into the two sides of the reducer, aligned correctly and welded with compatible electrofusion equipment. It is commonly used where a larger PE-RT II main needs to transition to a smaller line in heating, hot-water, HVAC hydronic or other compatible thermal-fluid systems.

About PE-RT II Material

PE-RT II (Polyethylene of Raised Temperature Resistance Type II) is a thermoplastic polyethylene material developed for piping systems that must maintain mechanical strength at elevated temperatures. Compared with conventional polyethylene, PE-RT II offers improved long-term temperature resistance while retaining the benefits of a weldable plastic piping system.

Because PE-RT II remains thermoplastic, compatible pipes and fittings can be joined by butt fusion or electrofusion to create a continuous all-plastic welded pipeline system. The material is also valued for corrosion resistance, resistance to internal scaling, relatively low weight, smooth internal surfaces and installation flexibility.

Operating Temperature

PE-RT II is used in hot- and cold-water and heating applications where elevated-temperature performance is required. The exact allowable temperature depends on pipe and fitting design, SDR or wall thickness, operating pressure and application class. Many PE-RT II piping systems are designed for long-term service in approximately the 70–80°C range, while short-term or maximum design conditions can reach about 95°C. Final temperature and pressure limits should always be confirmed against the actual pipe specification and project design conditions.

Typical Applications

• Secondary district-heating and heat-distribution networks
• Building heating and hot-water circulation systems
• Radiant heating and underfloor heating systems
• HVAC hydronic heating and cooling circuits
• Heat-pump and geothermal circulation systems
• Compatible industrial hot-water and thermal-fluid pipelines

Selection Considerations

For project selection, confirm pipe outside diameter, SDR or wall thickness, design pressure, normal operating temperature, maximum temperature, fluid medium and installation method together. This is especially important for heating networks because allowable pressure changes with operating temperature and intended service life.

Product Details

Applications & Installation

Frequently Asked Questions

How is the reducer size specified?

The larger outside diameter is listed first and the smaller outside diameter second, for example 160 × 110 mm.

Which pressure classes are listed?

The supplied model list includes SDR11 / PN16 and SDR17 / PN10 configurations. Availability varies by size.

What information is needed for quotation?

Please send the required size combinations, SDR / PN class, quantities and delivery destination so we can confirm availability, pricing and lead time.

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