Two-part corrugated conduit for retrofit installation: BIS WS DUO for versatile applications
25 March 2026

When it comes to retrofitting or protecting cables and wires, the right conduit system is essential. An outstanding product in this field is the BIS WS DUO – a two-part corrugated conduit that is suitable both for retrofit installation and for demanding applications in various industries. This innovative product is available in polypropylene (PP) and polyamide (PA) and offers excellent mechanical and fire-protection properties.
What is the BIS WS DUO?
The BIS WS DUO is a two-part plastic corrugated conduit that was specially developed for retrofitting cables and wires. The clever thing about this system: it can be opened and closed again without any problems, so that cables and wires can be inserted or replaced at any time afterwards. This flexibility makes the BIS WS DUO particularly suitable for installations where a later change or extension of the wiring may be required.
Thanks to its high mechanical strength and outstanding fire-protection properties, the BIS WS DUO meets the highest requirements even in demanding environments. Whether in mechanical and plant engineering, railway technology or solar and photovoltaic systems – the corrugated conduit is a reliable protection for cables and wires.
Properties of the BIS WS DUO
1. Flexibility and simplicity of installation
The two-part corrugated conduit can be opened and closed again without laborious disassembly. This saves valuable time and reduces the effort involved in retrofitting or maintaining installations. This function is of great importance especially when retrofitting cables and wires, as it enables quick adjustments without having to re-lay the entire wiring.
2. High mechanical load capacity
The BIS WS DUO convinces with its excellent mechanical stability. The conduit withstands external influences such as pressure, abrasion or impacts and thus ensures long-term and safe protection of cables and wires. This property is particularly important in industrial environments where the risk of mechanical damage is high.
3. Choice of material: PP and PA
The BIS WS DUO is available in two variants: polypropylene (PP) and polyamide (PA)
Applications of the BIS WS DUO
The BIS WS DUO offers a wide range of possible applications, especially in the following areas:
- Mechanical and plant engineering: here the two-part corrugated conduit is often used for retrofit cable installation and the protection of wires. The flexibility of the product makes it possible to adapt or extend cable harnesses at any time without changing the entire installation.
- Railway technology: in railway technology, cable and wiring systems must withstand extreme conditions. The BIS WS DUO offers the necessary protection against mechanical stress and weathering, making it the ideal choice for applications in trains, stations and rail networks.
- Solar and photovoltaic systems: in solar systems, cables and wires must be reliably protected from environmental influences. Thanks to its UV resistance and robust design, the BIS WS DUO is also perfectly suited for this application.
Conclusion
The BIS WS DUO offers an excellent solution for the retrofit installation of cables and wires, both in industrial and in specialised applications. With its high mechanical and fire-protection properties, it is a reliable choice for demanding projects in mechanical and plant engineering, railway technology and the solar industry. The availability in polypropylene (PP) and polyamide (PA) ensures that the right conduit system is available for every application.
Discover the BIS WS DUO and benefit from a flexible, safe and efficient solution for your cable installation. You will find further information on the product pages:
- BIS WS DUO PP
- BIS WS DUO PA
Rely on quality and flexibility – with the BIS WS DUO.
Questions about this topic?
Our sales team is happy to advise you and prepare an individual quote.
Get in touch


