The FlexiGas 15mm Double Sleeved Flexible Gas Pipe (DS-15) – 25m Box is a pre-sleeved, twin-layer CSST gas pipe designed to cover a wide range of UK installation scenarios straight out of the box. Its built-in sleeve allows installation through solid walls, solid floors, screed, soil and unvented voids without requiring additional sleeving on site.
Manufactured to BS/EN 15266 and certified under the BSI Kitemark scheme (KM 598726), the DS-15 features a patent-pending pipe-in-pipe construction combining a corrugated stainless steel gas pipe with a yellow PE cover inside a V0 fire-rated corrugated sleeve. The flexible design bends easily by hand, allowing long continuous runs with fewer joints and an installation process stated to be up to 4× faster than copper or rigid steel.
15mm CSST Gas Pipe
25m Boxed Coil
Double Sleeved
BSI Kitemark KM 598726
130+ FGLink™ Fittings
Key Highlights
0.5 bar
Max Operating Pressure
Applications & Suitability
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Domestic gas supplies: Suitable for Gas Safe engineers running 15mm gas supplies.
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Boiler swaps: Suitable for domestic boiler replacement and associated gas supply installations.
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Hob feeds: Suitable for domestic hob gas supply applications.
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Fire feeds: Suitable for domestic gas fire supply applications.
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Complex routing: Designed for routing through solid walls, solid floors, screed, soil and unvented areas without additional sleeving on site.
Key Specifications
| Manufacturer / MPN |
FlexiGas™ / DS-15-25 |
| Size |
DN15 (15mm) |
| Length |
25 metres — boxed coil |
| CSST Outer / Internal Diameter |
18.1mm / 14.1mm |
| Total Max Diameter Including Sleeve |
26mm |
| Max 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) |
Patent-Pending Pipe-in-Pipe Design
Twin-layer construction: The DS-15 combines an inner corrugated stainless steel gas pipe with a yellow PE cover, positioned inside a V0 fire-rated corrugated sleeve.
Slidable configuration: The pipe-in-pipe design allows the CSST to be inserted and withdrawn, providing flexibility during installation and routing.
Built-In Sleeve for Multiple Installation Scenarios
The built-in sleeve is designed to meet the supplied requirements of BS 6891 and IGEM/UP/2, 3 & 7. The DS-15 can therefore be routed through a variety of installation environments, including solid floors, solid walls, structural elements, earth or soil, screed, unventilated voids and unventilated risers.
The small annulus also allows direct clipping where applicable, while the pre-sleeved construction removes the need for additional sleeving on site for the stated installation scenarios.
Solid Walls & Floors
Designed for routing through solid walls, solid floors and structural elements.
Screed & Soil
The supplied sleeving design supports routing through screed and earth or soil.
Unventilated Areas
Designed for unventilated voids and unventilated risers within the stated installation requirements.
Fast, Flame-Free Installation
The flexible CSST construction bends easily by hand to create long continuous runs with fewer joints and potential leak points. The supplied product information states that the pipe can install up to 4× faster than copper or rigid steel, helping streamline installation work.
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Hand-bendable: Bends easily by hand for flexible routing.
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Continuous runs: Allows long runs with far fewer joints.
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Flame-free: No soldering required.
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No sealants: Designed for installation without sealants.
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No specialist tools: Specialist tools are not required according to the supplied product information.
FGLink™ Compatibility & Bonding
The DS-15 is compatible with the full FlexiGas™ FGLink™ range of 130+ dezincification-resistant brass fittings, providing a secure metal-to-metal seal for connections.
The pipe is also FG Bond™ ready and can be paired with the integrated earthing terminal, which is certified to BS 951:2009, for electrical bonding.
Included & On-Site Features
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25m boxed coil: Supplied as a 25-metre pre-sleeved boxed coil.
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Metre-marked tubing: Makes measuring and cutting easier during installation.
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High-visibility yellow jacket: Provides clear identification on site.
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Silicone tape: One free roll of silicone tape is included in every box.
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FGLink™ compatibility: Works with 130+ compatible fittings from the FlexiGas range.
Standards, Certification & Fire Performance
BSI Kitemark
Certified under the BSI Kitemark scheme KM 598726.
EN 1775
Fire tested to EN 1775 Annex A & B as supplied.
BS/EN 15266
Manufactured to BS/EN 15266 with a stated maximum operating pressure of 0.5 bar.
Jacket Performance
Yellow jacket rated B-s1 d0 and UV resistant.
Ideal For
- Gas Safe engineers running 15mm gas supplies
- Domestic boiler swaps and gas supply installations
- Domestic hob gas feeds
- Domestic gas fire feeds
- Long continuous gas pipe runs
- Installations through walls, floors, screed, soil and unventilated areas
- Projects using FlexiGas DS end caps and FGLink™ fittings
Frequently Asked Questions
What size is the FlexiGas DS-15?
The DS-15 is a DN15 (15mm) flexible CSST gas pipe supplied as a 25-metre boxed coil.
Does the DS-15 require additional sleeving?
The DS-15 is pre-sleeved and designed to cover the stated installation scenarios without additional sleeving on site.
What is the maximum operating pressure?
The stated maximum operating pressure of the DS-15 is 0.5 bar, according to BS/EN 15266.
What is the length of the DS-15?
The DS-15 is supplied as a 25-metre boxed coil.
Which fittings are compatible with the DS-15?
The pipe is compatible with the FlexiGas™ FGLink™ range of 130+ dezincification-resistant brass fittings.
What certification does the DS-15 have?
The DS-15 is certified under the BSI Kitemark scheme KM 598726 and manufactured to BS/EN 15266. It has also passed EN 1775 Annex A & B fire testing.
What is included with the FlexiGas DS-15?
Each box includes the 25m pre-sleeved CSST gas pipe and one free roll of silicone tape.
FlexiGas 15mm Double Sleeved Flexible Gas Pipe DS-15 – 25m Box provides a flexible solution for domestic gas installations, including boiler swaps, hob feeds and gas fire supplies. With its pre-sleeved pipe-in-pipe design, hand-bendable CSST construction, 25m length, 0.5 bar maximum operating pressure, BSI Kitemark certification and compatibility with 130+ FGLink™ fittings, it is designed for efficient routing through a wide range of installation environments without additional sleeving on site.
