Flexible Gas Pipe: CSST Not Appliance Hose

Terminology note

Looking for flexible gas pipe, not an appliance hose?

Flexigas is a CSST gas pipe system for fixed gas pipework. If you landed here through a flexible gas hose search, start with the current CSST versus copper guide and confirm suitability with a competent Gas Safe engineer.

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BSI Kitemark KM 598726 | BS EN 15266:2007 | MOP 0.5 bar | DN15-DN50 | Gas Safe/ACS context

Current terminology

Flexible gas hose search? Check whether you mean fixed CSST pipework.

Many people search for flexible gas hose when they are comparing flexible gas pipe, CSST or copper for fixed gas pipework. Flexigas is a BSI Kitemarked CSST system for fixed gas installations, not a loose appliance connector. The useful question is whether a certified flexible fixed-pipework route is suitable for the load, route, pressure drop and standards context.

Search termWhat it usually meansNext check
Flexible appliance hoseA short appliance connector. This is not what Flexigas CSST is.Use the appliance manufacturer and gas-safety guidance for appliance connections.
Flexible gas pipe or CSSTFixed gas pipework that can be routed in long flexible lengths.Check sizing, support, bonding, bend radius, protection and the current Flexigas installation guide.
Copper pipeworkEstablished rigid pipework for many domestic gas routes.Compare route complexity, hot works, intermediate joints and access before choosing the system.
316L stainless steel CSSTBSI Kitemark KM 598726BS EN 15266:2007MOP 0.5 barDN15-DN50

For Flexigas, BS 6891:2015 applies across the DN15-DN32 domestic pipework context noted by Flexigas. DN40/DN50 and work above that scope should be checked against the relevant IGEM/UP/2 or project design context.

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Flexible gas pipe questions

Is Flexigas a flexible gas hose?

No. Flexigas is CSST for fixed gas pipework. It should not be treated as a loose flexible appliance hose.

What does flexible gas pipe usually mean on this page?

For Flexigas, it means corrugated stainless steel tubing used as part of a fixed gas pipework system.

Who can install Flexigas CSST?

Gas work must be carried out by a competent Gas Safe registered engineer with the relevant ACS or allied qualification context.

Can Flexigas replace copper on every job?

No single pipework method suits every job. The right system depends on load, route length, pressure drop, access, standards context and installer competence.

Can Flexigas be mixed with other CSST systems?

No. Use Flexigas tubing and Flexigas fittings as a system. Do not mix Flexigas CSST or fittings with other manufacturers' CSST systems.

Flexible gas pipe and CSST for fixed gas pipework

Flexigas supplies BSI Kitemarked CSST for fixed gas pipework. Installers and buyers often search for flexible gas hose when they mean flexible gas pipe or CSST; the important distinction is that Flexigas is not a loose appliance hose. It is a gas pipework system that must be sized, installed and tested by a competent Gas Safe registered engineer using current Flexigas guidance.

Routing flexibility

Rigid copper pipework remains a familiar option for many routes. Flexigas CSST can help on suitable projects because long, flexible lengths may reduce intermediate joints and hot works compared with some rigid routes. The route still needs correct sizing, bend radius, support, bonding, protection and tightness testing.

Fewer joints to manage

Reducing unnecessary joints can simplify inspection and route planning, but every gas installation still needs proper workmanship and tightness testing. Flexigas CSST uses 316L stainless steel tubing and must be installed as a Flexigas system with Flexigas fittings.

Project cost checks

Project cost depends on material prices, route complexity, installer workflow and the design standard. Flexigas CSST can be commercially attractive where routing flexibility, fewer intermediate joints and less hot work matter, but each job should be assessed on its own route, size and standards context.

Should I use Flexigas CSST on a project?

For current project guidance, compare the route against Flexigas technical documents, confirm sizing and speak to the Flexigas team where the job involves unusual routes, voids, DN40 or DN50 pipework, or DS availability questions. Flexigas DS is in transition, so contact technical support for current DS availability and installed-base guidance.