The FlexiGas 50mm Double Sleeved Flexible Gas Pipe (DS-50) – 50m Spool is a pre-sleeved, twin-layer CSST gas pipe designed to pass through solid walls, solid floors, screed, soil and unvented voids directly from the spool without requiring additional sleeving on site. Certified under the BSI Kitemark scheme (KM 598726) and manufactured to BS/EN 15266, it bends easily by hand for long continuous runs and is designed for installation speeds of up to four times faster than copper or rigid steel.
DN50 / 50mm
50m Spool
BSI Kitemark KM 598726
1-Year Warranty
Pipe Size
DN50 / 50mm
Spool Length
50 metres
Max Pressure
0.5 bar
Construction
1.4404 / 1.4541 stainless steel
Applications & suitability
Commercial Gas Mains
Designed for commercial and industrial contractors installing 50mm gas mains and long continuous gas runs.
Plant Rooms
The 50m spool is suited to longer plant room gas feeds where continuous runs and exact cuts can help reduce wastage.
Commercial Kitchens
Suitable for large gas distribution runs serving commercial kitchen installations and multiple appliances.
Complex Routing
The flexible construction allows the pipe to bend by hand and route through solid floors, walls, screed, soil and unventilated voids.
Key specifications
| Manufacturer / MPN |
FlexiGas™ / DS-50-50 |
| Size |
DN50 (50mm) |
| Length |
50 metres – spool |
| 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 design comprising an inner corrugated stainless steel gas pipe with yellow PE cover inside a V0 fire-rated corrugated sleeve in a slidable configuration. The integrated sleeve is designed to meet the sleeve definition referenced in BS 6891 and IGEM/UP/2, 3 & 7, allowing installation through solid floors, solid walls, structural elements, earth, soil, screed, unventilated voids and unventilated risers. The small annulus also allows direct clipping.
Design & performance benefits
Pipe-in-Pipe Construction
The twin-layer design combines corrugated stainless steel tubing with a protective yellow PE cover and V0 fire-rated corrugated sleeve.
Flexible Installation
The CSST bends easily by hand, supporting long continuous runs with fewer joints and potential leak points.
Flame-Free Installation
No soldering, sealants or specialist tools are required according to the supplied product information.
Secure Connections
Pairs with FlexiGas™ DN50 male BSP adaptors and straight unions in dezincification-resistant brass for metal-to-metal sealing.
Additional installation features
FG Bond Ready
The integrated earthing terminal is certified to BS 951:2009 and is designed for use with FG Bond™.
Built-In Sleeve
The integrated sleeve is manufactured for the stated BS 6891 and IGEM/UP/2, 3 & 7 installation requirements.
Site-Friendly Spool
Metre-marked tubing, a high-visibility yellow jacket and one free roll of silicone tape are supplied with every spool.
Ideal for
Commercial Gas Mains
Commercial and industrial contractors running 50mm gas mains and long continuous feeds.
Plant Rooms
Long plant room gas runs where a 50m spool provides continuous material and flexible routing.
Commercial Kitchens
Gas feeds for commercial kitchen installations and multiple appliances.
Professional Gas Installers
Suitable for contractors looking for flexible 50mm CSST with integrated sleeving and a 50m spool length.
The FlexiGas 50mm Double Sleeved Flexible Gas Pipe DS-50 combines a 50m spool length, integrated fire-rated sleeving, flexible stainless steel construction and BSI Kitemark certification. With a maximum operating pressure of 0.5 bar, EN 1775 fire performance and compatibility with FlexiGas DN50 fittings, it is designed for commercial and industrial gas installations requiring long, flexible and continuous gas runs.
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🆓 Free Local Delivery (Orders £100 & above)
We offer FREE delivery on orders £100 or more
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For orders that do not qualify for free delivery, standard
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Examples:
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For oversized items where the product length is 1.5 metres or more:
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Customers can also choose to collect their order from our store in
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