The FlexiGas 22mm Double Sleeved Flexible Gas Pipe (DS-22-25) is a 25-metre coil of pre-sleeved corrugated stainless-steel tubing (CSST), designed for gas-pipework routes where a sleeve or duct is required. Its pipe-in-pipe construction combines an inner gas tube with a movable outer sleeve, while its flexible design can help installers route longer runs with fewer joints than rigid pipework. The product is listed as BSI Kitemark certified (KM 598726) and manufactured to BS EN 15266.
The supplied specifications state a DN22 size, 25-metre boxed coil, maximum operating pressure of 0.5 bar and maximum overall diameter of 35mm, including the sleeve. Confirm current product availability, documentation, suitability and installation requirements with FlexiGas and your installer before specifying or installing.
22mm DN22 CSST
25m Boxed Coil
Double-Sleeved Design
Maximum Operating Pressure: 0.5 bar
At a Glance
Product Type
Double-Sleeved CSST
FlexiGas DS gas pipe
Nominal Size
DN22 (22mm)
Model: DS-22-25
Coil Length
25 metres
Supplied in a box
Maximum Operating Pressure
0.5 bar
As specified for BS EN 15266
Key Features
Pipe-in-Pipe Construction
The double-sleeved configuration pairs flexible corrugated stainless-steel gas tubing with a separate outer sleeve. The inner tube is designed to slide within the sleeve; check current manufacturer guidance for the approved application and installation method.
Flexible Routing for Longer Runs
The CSST can be bent by hand to help route pipework around obstacles and may reduce the need for multiple joints compared with rigid pipe. Plan and size each gas installation according to the applicable design requirements.
Pre-Sleeved Format
The supplied sleeve is intended for specified routes where sleeving or a duct is required. The product information references BS 6891 and IGEM/UP/2, 3 and 7; confirm the latest applicable guidance and requirements for the particular installation before use.
FlexiGas Fittings Compatibility
Use genuine FlexiGas fittings specified for the tubing system. The manufacturer advises that FlexiGas CSST and fittings should not be mixed with other manufacturers’ CSST systems. Check current compatibility documentation before ordering components.
Kitemark-Certified CSST
The supplied product information identifies BSI Kitemark certification KM 598726 and manufacture to BS EN 15266. Confirm the current certification and product documentation for the DS model before specification.
Convenient 25m Boxed Coil
The 25-metre boxed coil provides a practical length for planned installation runs. Measure the route and confirm the required diameter, fittings and system design with the qualified installer.
Important Gas Installation Guidance:
Gas pipework must be designed, installed, tested and commissioned by a competent, appropriately qualified Gas Safe registered engineer. Before purchase or installation, confirm current availability, suitability, technical documentation, certification and applicable requirements with the manufacturer and installer.
Key Specifications
| Product |
FlexiGas 22mm Double Sleeved Flexible Gas Pipe |
| Manufacturer / Model |
FlexiGas / DS-22-25 |
| Nominal Size |
DN22 (22mm) |
| Length |
25 metres, boxed coil |
| CSST Outer Diameter |
25.6mm |
| CSST Internal Diameter |
21.4mm |
| Maximum Diameter Including Sleeve |
35mm |
| Maximum Operating Pressure |
0.5 bar, as specified |
| Tubing Material |
1.4404 / 1.4541 stainless steel (BS EN 10088), as supplied |
| Colour |
Yellow |
| Fire Performance |
EN 1775 Annex A and B tested; jacket classification B-s1 d0, as supplied |
| Certification |
BSI Kitemark KM 598726; EN 15266, as supplied |
| Warranty |
1 year, subject to the manufacturer’s terms and conditions |
Frequently Asked Questions
What is the FlexiGas DS-22-25?
It is a 22mm (DN22) double-sleeved flexible CSST gas pipe supplied as a 25-metre boxed coil. Confirm current availability and product guidance with FlexiGas before specifying.
What is the maximum operating pressure?
The supplied specification states a maximum operating pressure of 0.5 bar. The gas-system design and product suitability must be checked by a qualified installer against the current manufacturer documentation.
Can it be used with other CSST fittings?
Use fittings specified for the FlexiGas tubing system. The manufacturer advises against mixing FlexiGas tubing with other manufacturers’ CSST systems. Confirm exact fitting compatibility using current technical guidance.
The FlexiGas DS-22-25 combines 22mm flexible CSST tubing, a double-sleeved configuration and a 25-metre boxed length for specified gas-pipework applications. Confirm current product information with FlexiGas and have a qualified Gas Safe registered engineer check suitability and installation requirements before ordering.
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