BSI Kitemark KM 598726
Independently certified and factory-audited by BSI. Over a decade of UK gas installations behind it.
For specifiers
For specifying gas systems in 2026.
Flexigas is corrugated 316L stainless-steel gas pipe, BSI Kitemarked to BS EN 15266 and specified across residential and light commercial work. The standards, the certification and the spec language, in one place.
BSI Kitemark KM 598726
BS EN 15266:2007
MOP 0.5 bar
316L stainless
EN 1775 fire tested
Standards & certification
Specify it with confidence.
Independently certified, manufactured to standard, and installed to British Standards by Gas Safe registered engineers.
BS EN 15266:2007
The CSST manufacturing standard for gas. Maximum operating pressure 0.5 bar, fire performance tested to EN 1775.
Installed to British Standards
BS 6891:2015 for DN15 to DN32, IGEM/UP/2 for DN40 and DN50, bonded to BS 7671, tightness tested to IGE/UP/1B.
Where it fits
Specified where flexibility earns its place.
New-build residential
House builders and developers, for gas carcass and final connections at pace, with fewer joints to inspect.
Light commercial
Small commercial, plant rooms and rooftop runs within the scope of BS EN 15266 and IGEM/UP/2.
Refurbishment
Awkward existing buildings where routing flexible tube beats cutting and soldering rigid copper.
Spec language
Drop this straight into your specification.
Plain specification text for flexible gas supply pipework. Edit to suit the project.
Flexible gas supply pipework
Flexible gas supply pipework shall be Flexigas corrugated stainless steel tubing (CSST) manufactured to BS EN 15266:2007, certified under BSI Kitemark licence KM 598726, with a maximum operating pressure of 0.5 bar.
Tube and fittings shall be installed in accordance with BS 6891:2015 (sizes DN15 to DN32) and IGEM/UP/2 (sizes DN40 and DN50), bonded in accordance with BS 7671, and commissioned by a Gas Safe registered engineer with tightness testing to IGE/UP/1B.
Need this as part of a wider spec, or a project-specific version? Send a specifier enquiry and we will help.
For the spec file
Datasheets and certification.
Data sheet
Sizes, dimensions, materials and working parameters.
BSI Kitemark certificate
KM 598726, certified to BS EN 15266, for building control and the spec file.
Installation guide
How it is installed, bonded, tested and signed off on site.
Specifier enquiry
Specifying Flexigas on a project?
Tell us about the project and we will get you the standards detail, spec language and technical answers you need.