The FlexiGas 40mm Double Sleeved Flexible Gas Pipe (DS-40) – 100m Spool is a pre-sleeved, twin-layer CSST gas pipe designed to simplify large-scale gas installations. Its patent-pending pipe-in-pipe design combines a corrugated stainless steel gas pipe with a yellow PE cover inside a V0 fire-rated corrugated sleeve, providing a ready-to-install solution for solid walls, solid floors, screed, soil and unventilated voids without requiring additional sleeving on site.
Manufactured to BS/EN 15266 and certified under the BSI Kitemark scheme (KM 598726), the DS-40 can be bent by hand to create long continuous runs with fewer joints and potential leak points. With a 100 metre spool, it is particularly suited to commercial installers and developers carrying out 40mm gas pipework installations at volume.
Key Features
Patent-Pending Pipe-in-Pipe Design
The DS-40 combines an inner corrugated stainless steel gas pipe with a yellow PE cover, positioned inside a V0 fire-rated corrugated sleeve in a slidable configuration. This allows the CSST to be inserted and withdrawn when required.
Built-In Sleeving for Multiple Installation Scenarios
The pre-sleeved construction meets the supplied BS 6891 and IGEM/UP/2, 3 & 7 sleeve requirements for installation through solid floors, solid walls, structural elements, earth or soil, screed, unventilated voids and unventilated risers.
Fast, Flame-Free Installation
The flexible CSST bends by hand and can be installed in long continuous runs with fewer joints and potential leak points. Installation requires no soldering, sealants or specialist tools according to the supplied product information.
Secure Metal-to-Metal Connection
Compatible with the FlexiGas FGLink™ range, including more than 25 DN40 fitting types manufactured in dezincification-resistant brass for a secure connection solution.
FG Bond™ Ready
The DS-40 can be paired with the integrated earthing terminal certified to BS 951:2009 for a quick and tidy electrical bonding installation.
Ready for Commercial Installation
Metre-marked tubing, a high-visibility yellow jacket and one free roll of silicone tape supplied with every spool make the DS-40 practical for installers working on larger gas pipework projects.
Designed for Flexible Gas Pipe Installation
The FlexiGas DS-40 is designed for applications where a 40mm flexible gas pipe needs to pass through a variety of building and installation environments. The built-in sleeve eliminates the requirement for additional sleeving on site across the installation scenarios specified by the manufacturer.
Solid Walls & Floors Suitable for specified installations through solid walls, solid floors and structural elements.
Screed & Soil
The pre-sleeved construction is designed for the supplied installation scenarios including screed and earth or soil.
Unventilated Voids
Built-in sleeving supports the specified use through unventilated voids and unventilated risers.
Long Continuous Runs
Flexible tubing can be bent by hand to create continuous runs with fewer joints.
Certification & Compliance
The DS-40 is manufactured to BS/EN 15266 and certified under the BSI Kitemark scheme (KM 598726). The supplied product information also states that the pipe has passed EN 1775 Annex A & B fire testing, with a jacket fire classification of B-s1 d0.
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BSI Kitemark: KM 598726
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Manufacturing standard: BS/EN 15266
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Fire testing: EN 1775 Annex A & B passed
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Jacket classification: B-s1 d0
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Electrical bonding: FG Bond™ ready with terminal certified to BS 951:2009
Technical Specifications
| Manufacturer / MPN | FlexiGas™ / DS-40-100 |
| Size | DN40 (40mm) |
| Length | 100 metres — spool |
| CSST Outer / Internal Diameter | 50mm / 41mm |
| Total Maximum Diameter Including Sleeve | 63mm |
| Maximum Operating Pressure | 0.5 bar (BS/EN 15266) |
| Tubing Material | 1.4404 / 1.4541 stainless steel (BS/EN 10088) |
| Fire Performance | EN 1775 Annex A & B passed; jacket B-s1 d0; UV resistant |
| Certification | BSI Kitemark KM 598726, EN 15266 |
| Colour | Yellow |
| Warranty | 1 year (subject to manufacturer's T&Cs) |
Installation Benefits
Flexible by hand: The corrugated stainless steel pipe can be bent by hand, helping installers create long continuous routes.
Fewer joints: Continuous runs can reduce the number of connections and potential leak points compared with installations requiring numerous rigid sections.
No additional sleeving: The pipe-in-pipe construction provides the built-in sleeve required for the specified installation scenarios.
Convenient spool format: The 100m spool allows installers to make exact cuts for larger projects while helping minimise material wastage.
Ideal For
The FlexiGas DS-40 100m spool is particularly suited to commercial installers, developers and larger gas pipework projects requiring 40mm flexible gas pipe. The 100m spool provides a practical format for high-volume installation work, allowing exact cuts and helping minimise wastage.
- Commercial gas installation projects
- Large-scale 40mm gas pipework installations
- Projects requiring flexible continuous gas pipe runs
- Installations through solid walls, floors, screed and soil
- Specified unventilated void and riser installations
- High-volume installation work where a 100m spool is practical
Compatible & Complementary Products
The DS-40 can be paired with the FlexiGas range of installation accessories and connection components, including:
FGLink™ DN40 Fittings 25+ fitting types available
FlexiGas Spool Roller Designed for spool handling
DS End Caps For the DS installation system
Frequently Asked Questions
What is the FlexiGas DS-40?
The FlexiGas DS-40 is a 40mm DN40 double-sleeved flexible gas pipe supplied on a 100 metre spool. It uses a pipe-in-pipe CSST design with a built-in sleeve.
Does the DS-40 require additional sleeving?
The supplied product information states that the pre-sleeved DS-40 passes through the specified installation scenarios without additional sleeving on site.
What length is the FlexiGas DS-40 supplied in?
The DS-40 is supplied as a 100 metre spool, making it suitable for larger gas installation projects and long continuous runs.
What is the maximum operating pressure?
The specified maximum operating pressure is 0.5 bar in accordance with BS/EN 15266.
Is the DS-40 compatible with FlexiGas fittings?
Yes. The supplied information states that the DS-40 is compatible with the FlexiGas FGLink™ range, including more than 25 DN40 fitting types.
What is included with the spool?
Each spool includes one free roll of silicone tape. The tubing is also metre-marked and supplied with a high-visibility yellow jacket.
FlexiGas DS-40 100m Spool
A pre-sleeved DN40 flexible gas pipe solution for larger installation projects, combining flexible CSST construction, built-in sleeving, BSI Kitemark certification and a practical 100 metre spool format for commercial installers and developers.
