The FlexiGas 28mm Double Sleeved Flexible Gas Pipe (DS-28) – 50m Spool is a pre-sleeved, twin-layer CSST gas pipe designed for continuous gas installation runs across a wide range of scenarios. Its pipe-in-pipe construction combines an inner corrugated stainless steel gas pipe with a yellow PE cover inside a V0 fire-rated corrugated sleeve, providing a ready-to-install solution through solid walls, solid floors, screed, soil and unventilated voids.
Manufactured to BS/EN 15266 and certified under the BSI Kitemark scheme (KM 598726), the DS-28 can be bent by hand for fast, flame-free installation with fewer joints and potential leak points. The 50m spool is particularly suited to larger domestic and light-commercial installations where longer continuous runs, exact cuts and reduced material wastage are important.
28mm CSST
50m Spool
Double Sleeved
BSI Kitemark Certified
1 Year Warranty
Key Performance Highlights
50m
Spool Length
28mm
Nominal Size
0.5 bar
Max Operating Pressure
130+
Compatible FGLink™ Fittings
Applications & Suitability
The FlexiGas DS-28 50m spool is designed for larger domestic and light-commercial gas installations requiring a 28mm flexible CSST solution with integrated sleeving.
- Larger domestic 28mm gas installations requiring longer continuous runs.
- Light-commercial gas installations where flexible pipework can simplify routing.
- Installations through solid floors, solid walls and structural elements.
- Runs through earth or soil, screed and unventilated voids.
- Projects where fewer joints and exact cuts can help reduce potential leak points and material wastage.
- Installations using the FlexiGas™ FGLink™ fitting range.
Key Specifications
| Manufacturer / MPN |
FlexiGas™ / DS-28-50 |
| Size |
DN28 (28mm) |
| Length |
50 metres — spool |
| CSST Outer / Internal Diameter |
32mm / 27mm |
| Total Max Diameter Including Sleeve |
41mm |
| 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 |
Pipe-in-Pipe Double Sleeved Design
The DS-28 uses a patent-pending pipe-in-pipe design. The inner corrugated stainless steel gas pipe is combined with a yellow PE cover and positioned inside a V0 fire-rated corrugated sleeve in a slidable configuration. This allows the CSST to be inserted and withdrawn while providing integrated sleeving without the need for additional sleeving on site.
Integrated Sleeving
Pre-sleeved construction is designed to cover the stated installation scenarios directly from the spool.
Flexible CSST
Corrugated stainless steel tubing bends by hand to support long continuous installation runs.
V0 Fire-Rated Sleeve
The CSST is contained within a V0 fire-rated corrugated sleeve in a slidable configuration.
Installation & Routing
The FlexiGas DS-28 is designed for fast, flame-free installation. The flexible pipe can be bent by hand into continuous runs, reducing the number of joints required compared with rigid pipework. The supplied information states that it can be installed through solid floors, solid walls, structural elements, earth/soil, screed, unventilated voids and unventilated risers.
- No soldering required.
- No sealants required.
- No specialist tools required for bending and routing.
- Metre-marked tubing helps with measuring and cutting.
- High-visibility yellow jacket makes the pipe easy to identify on site.
- Small annulus allows direct clipping in the stated unventilated void applications.
FGLink™ Fittings & Metal-to-Metal Sealing
The DS-28 is compatible with the FlexiGas™ FGLink™ range of 130+ dezincification-resistant brass fittings. The system is designed around a secure metal-to-metal seal, providing compatibility with the wider FlexiGas fitting range.
130+ FGLink™ Fittings
Compatible with the full FlexiGas™ FGLink™ range of 130+ fittings.
FG Bond™ Ready
Can be paired with the integrated earthing terminal certified to BS 951:2009 for electrical bonding.
Silicone Tape Included
One free roll of silicone tape is included with every spool.
Standards, Certification & Fire Performance
The DS-28 is manufactured to BS/EN 15266 and certified under the BSI Kitemark scheme KM 598726. The supplied specification also states that it has passed EN 1775 Annex A & B fire testing, with a B-s1 d0, UV-resistant jacket.
- BSI Kitemark certification: KM 598726.
- Manufactured to BS/EN 15266.
- EN 1775 Annex A & B fire testing passed.
- Jacket classification: B-s1 d0.
- UV resistant jacket.
- Tubing material to BS/EN 10088.
Included with the 50m Spool
DS-28 Gas Pipe
50 metres of pre-sleeved 28mm flexible CSST gas pipe supplied on a spool.
Silicone Tape
One free roll of silicone tape is included with every spool.
Ideal For
- Contractors working on larger domestic 28mm gas installations.
- Light-commercial gas installation projects.
- Longer gas pipe runs requiring a 50m spool.
- Projects where exact cuts and reduced wastage are beneficial.
- Installations requiring flexible routing through the stated solid, screed, soil and unventilated applications.
- Installers using FlexiGas™ FGLink™ fittings and accessories.
Frequently Asked Questions
What size is the FlexiGas DS-28?
The DS-28 is a DN28 (28mm) flexible CSST gas pipe supplied as a 50-metre spool.
What is the maximum operating pressure?
The stated maximum operating pressure is 0.5 bar in accordance with BS/EN 15266.
Does the pipe require additional sleeving?
The product is supplied as a pre-sleeved, double-layer CSST system designed to cover the stated installation scenarios directly from the spool.
What is the total diameter including the sleeve?
The stated maximum total diameter including the sleeve is 41mm.
What fittings are compatible with the DS-28?
The DS-28 is compatible with the FlexiGas™ FGLink™ range of 130+ dezincification-resistant brass fittings.
Is silicone tape included?
Yes. One free roll of silicone tape is included with every spool.
What warranty is provided?
The supplied specification states a 1-year warranty, subject to the manufacturer's terms and conditions.
FlexiGas DS-28 50m Spool at a Glance
The FlexiGas 28mm Double Sleeved Flexible Gas Pipe DS-28 provides a 50m pre-sleeved CSST solution for larger domestic and light-commercial gas installations. With pipe-in-pipe construction, hand-bendable stainless steel tubing, integrated sleeving, BSI Kitemark certification and compatibility with 130+ FGLink™ fittings, it is designed to support efficient continuous gas pipe runs across the stated installation scenarios.
