The FlexiGas 50mm Double Sleeved Flexible Gas Pipe (DS-50) – 25m Box is a pre-sleeved, twin-layer CSST gas pipe designed to cover a wide range of installation scenarios straight out of the box. Its built-in sleeve allows installation through solid walls, solid floors, screed, soil, unventilated voids and risers without requiring additional sleeving on site.
Certified under the BSI Kitemark scheme (KM 598726) and manufactured to BS/EN 15266, the FlexiGas DS-50 bends easily by hand to create long continuous runs. The pipe-in-pipe design combines an inner corrugated stainless steel gas pipe with a yellow PE cover inside a V0 fire-rated corrugated sleeve, providing a slidable configuration that allows the CSST to be inserted and withdrawn.
DN50 / 50mm
25m Boxed Coil
BSI Kitemark KM 598726
0.5 bar Max Pressure
50mm CSST
DN50 flexible corrugated stainless steel gas pipe with a 50mm internal diameter.
25m Continuous Run
Supplied as a 25-metre boxed coil for long continuous installations.
Built-In Sleeve
Pre-sleeved design for the specified installation environments without additional sleeving.
Fire Tested
EN 1775 Annex A & B fire tested with a B-s1 d0 UV-resistant jacket.
Applications & suitability
Plant Rooms
Suitable for commercial and industrial gas installations running 50mm mains to plant rooms.
Commercial Kitchens
Designed for larger gas installations serving commercial kitchen applications.
Multi-Appliance Systems
Suitable for installations where a 50mm gas supply serves multiple appliances.
Challenging Routes
Can be routed through walls, floors, screed, soil and specified unventilated areas.
Key specifications
| Manufacturer / MPN |
FlexiGas™ / DS-50-25 |
| Size |
DN50 (50mm) |
| Length |
25 metres – boxed coil |
| CSST Outer / Internal Diameter |
60mm / 50mm |
| Total Maximum Diameter Including Sleeve |
73mm |
| 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 & compatibility
The FlexiGas DS-50 features a patent-pending pipe-in-pipe configuration consisting of an inner corrugated stainless steel gas pipe with yellow PE cover, positioned inside a V0 fire-rated corrugated sleeve. The slidable configuration allows the CSST to be inserted and withdrawn.
The integrated sleeve is specified for installation through solid floors, solid walls, structural elements, earth/soil, screed, unventilated voids and unventilated risers. For connections, the pipe pairs with FlexiGas™ DN50 male BSP adaptors and straight unions in dezincification-resistant brass. Installation must comply with applicable gas installation regulations and manufacturer requirements.
Design & performance benefits
Pipe-in-Pipe Design
Twin-layer construction combines the flexible CSST gas pipe with an integrated corrugated protective sleeve.
Hand-Bendable CSST
The flexible tubing bends by hand to help create long continuous gas pipe runs.
Metal-to-Metal Seal
Designed to pair with FlexiGas DN50 male BSP adaptors and straight unions for secure connections.
Fire Performance
Passed EN 1775 Annex A & B fire testing with a B-s1 d0 UV-resistant jacket.
Additional installation features
Integrated Earthing Ready
FG Bond™ ready when paired with the integrated earthing terminal certified to BS 951:2009.
Metre-Marked Tubing
Metre markings help provide convenient measurement during installation.
Silicone Tape Included
Each box includes one free roll of silicone tape for on-site use.
Ideal for
The FlexiGas 50mm Double Sleeved Flexible Gas Pipe DS-50 – 25m Box is ideal for commercial and industrial gas engineers installing 50mm gas mains to plant rooms, commercial kitchens and multi-appliance installations. Its integrated sleeve, flexible CSST construction, fire-tested design and compatibility with FlexiGas DN50 fittings make it suited to installations requiring flexible routing through walls, floors, screed and specified unventilated areas without additional sleeving.
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