The FlexiGas 50mm Double Sleeved Flexible Gas Pipe (DS-50) – 75m Spool is a pre-sleeved, twin-layer CSST gas pipe designed for fast, continuous gas installation runs across a wide range of installation scenarios. The pipe is supplied with a built-in sleeve, allowing installation through solid walls, solid floors, screed, soil, unventilated voids and unventilated risers without additional sleeving on site.
Manufactured to BS/EN 15266 and certified under the BSI Kitemark scheme KM 598726, the DS-50 combines a 50mm stainless steel CSST pipe with a protective double-sleeved configuration. The flexible pipe bends easily by hand, supporting long continuous runs with fewer joints and no requirement for soldering, sealants or specialist tools. The 75m spool is particularly suited to larger commercial and industrial gas installations where continuous runs and reduced wastage are important.
50mm CSST Gas Pipe
75m Spool
Double Sleeved
0.5 Bar Max Pressure
BSI Kitemark KM 598726
Free Silicone Tape
Key Highlights
0.5 bar
Max Operating Pressure
60/50mm
Outer / Internal Diameter
Applications & Suitability
- Commercial and industrial contractors installing larger gas mains.
- Long continuous gas pipe runs where minimising joints and wastage is important.
- Installations through solid floors, solid walls and structural elements.
- Gas pipework routed through screed, earth or soil.
- Unventilated voids and unventilated risers where the supplied sleeve configuration is suitable.
- Projects requiring a flexible 50mm CSST gas pipe supplied on a 75m spool.
- Installations where fast, flame-free pipework installation is preferred.
Key Specifications
| Manufacturer / MPN |
FlexiGas™ / DS-50-75 |
| Size |
DN50 (50mm) |
| Length |
75 metres — spool |
| CSST Outer Diameter |
60mm |
| CSST Internal Diameter |
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 |
Patent-Pending Pipe-in-Pipe Design
The DS-50 uses a patent-pending pipe-in-pipe design consisting of 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 arrangement allows the CSST to be inserted and withdrawn while providing the built-in sleeve configuration required for the stated installation scenarios.
The integrated sleeve design removes the need for additional sleeving on site for the installation scenarios specified by the manufacturer, helping simplify preparation and installation.
Built-In Sleeve for Multiple Installation Scenarios
The FlexiGas DS-50 is designed to meet the definition of a sleeve in the stated UK regulations and guidance, including BS 6891 and IGEM/UP/2, IGEM/UP/3 and IGEM/UP/7. The supplied information identifies suitability for routing through solid floors, solid walls, structural elements, earth or soil, screed, unventilated voids and unventilated risers.
The small annulus allows the pipe to be directly clipped in the stated unventilated riser applications.
Fast, Flame-Free Installation
The flexible CSST construction allows the pipe to bend by hand into continuous runs, reducing the number of joints and potential leak points compared with more joint-intensive installation methods. The supplied product information states that installation can be up to 4× faster than copper or rigid steel.
The system requires no soldering, sealants or specialist tools for the flexible pipe installation, supporting a straightforward flame-free installation process.
Secure Metal-to-Metal Connections
The DS-50 is designed to pair with FlexiGas™ DN50 male BSP adaptors and straight unions. These fittings are specified as being manufactured from dezincification-resistant brass, providing the stated metal-to-metal connection arrangement for the CSST system.
FG Bond™ Electrical Bonding
The FlexiGas DS-50 is FG Bond™ ready and can be paired with its integrated earthing terminal for electrical bonding. The supplied information states that the earthing terminal is certified to BS 951:2009, providing a dedicated bonding arrangement for the installation.
On-Site Installation Features
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75m spool: Supports long continuous gas pipe runs across larger projects.
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Metre-marked tubing: Helps identify pipe length during installation.
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High-visibility yellow jacket: Makes the pipe easy to identify on site.
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Free silicone tape: One roll is included with every spool.
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Flexible CSST construction: Allows the pipe to be bent by hand.
Fire Performance & Certification
The DS-50 has been fire tested to EN 1775 Annex A & B, with the jacket specified as B-s1 d0 and UV resistant. The pipe is manufactured to BS/EN 15266 and carries the BSI Kitemark KM 598726.
Certification: BSI Kitemark KM 598726 and EN 15266, with EN 1775 Annex A & B fire testing stated for the product.
Ideal For
- Commercial gas installation contractors.
- Industrial gas installation projects.
- Larger sites requiring long 50mm gas mains.
- Projects where continuous runs and reduced jointing are preferred.
- Installations through walls, floors, screed, soil and unventilated spaces.
- Projects requiring a 75m DN50 flexible gas pipe spool.
- Installers using FlexiGas spool rollers, DS end caps and DN50 fittings.
Frequently Asked Questions
What size is the FlexiGas DS-50?
The DS-50 is a DN50 (50mm) flexible CSST gas pipe with a 50mm internal diameter.
How long is the DS-50 spool?
The spool contains 75 metres of FlexiGas DS-50 flexible gas pipe.
What is the maximum operating pressure?
The maximum operating pressure is 0.5 bar, in accordance with the supplied BS/EN 15266 specification.
Does the pipe require additional sleeving?
The DS-50 has a built-in sleeve designed for the stated installation scenarios, so no additional sleeving is required on site for those scenarios.
What is the pipe made from?
The CSST tubing uses 1.4404 / 1.4541 stainless steel manufactured to BS/EN 10088, with a yellow PE cover and protective corrugated sleeve.
What is the maximum diameter including the sleeve?
The specified total maximum diameter including the sleeve is 73mm.
Is the FlexiGas DS-50 fire tested?
Yes. The supplied specification states that it has passed EN 1775 Annex A & B fire testing, with the jacket specified as B-s1 d0 and UV resistant.
What certification does the DS-50 have?
The pipe is certified under the BSI Kitemark scheme KM 598726 and manufactured to EN 15266.
What is included with the 75m spool?
Each spool includes one free roll of silicone tape.
What is the warranty?
The specified warranty is 1 year, subject to the manufacturer's terms and conditions.
FlexiGas 50mm Double Sleeved Flexible Gas Pipe DS-50 – 75m Spool
The FlexiGas DS-50 provides a 75-metre spool of 50mm double-sleeved CSST gas pipe for long, continuous gas installation runs. With its patent-pending pipe-in-pipe design, built-in sleeve, hand-bendable construction, 0.5 bar maximum operating pressure, BSI Kitemark KM 598726 certification and EN 1775 Annex A & B fire testing, it is designed for commercial and industrial installations where fast, joint-reduced and versatile gas pipe installation is required.
Order the FlexiGas DS-50 75m Spool today.
