Steel Convoluted Hoses
Steel convoluted hoses are flexible, corrugated stainless-steel tubes used to make the final connection between a gas supply and an appliance where rigid pipework isn't practical - typically where an appliance needs to be moved for cleaning or servicing, or when vibration needs to be absorbed rather than transmitted into fixed pipework. Unlike a rubber hose, the all-metal construction holds up to the higher temperatures found close to catering equipment and gas fires.
At BES, we offer steel convoluted hoses to BS EN ISO 10380:2003, available in bores of 1/2", 3/4" and 1", in braided and unbraided finishes, plus the brass adaptors needed to complete the connection.
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Our Steel Convoluted Hose Range
Our range splits into two distinct hose types depending on how each end connects, plus the adaptors that complete a BSP-ended installation.
Bayonet-Connection Hoses
These are built specifically for connecting a domestic gas cooker or appliance to a wall-mounted bayonet socket, with a BSP tapered male fitting at one end and a bayonet coupling at the other. They're supplied in 1/2" bore only, rated to 50 mbar and -20°C to 70°C, with the bayonet coupling itself tested to 50 mbar at up to 95°C. Available in 900mm and 4ft lengths, each in braided or unbraided finish: the Steel Convoluted Hose 4ft Braided and Steel Convoluted Hose 4ft Unbraided cover the longer length, with 900mm Braided and 900mm Unbraided versions also available.
BSP Swivel-Connection Hoses
This offering is built for a broader range of installations, with a BSP tapered male fitting at one end and a BSP female swivel at the other, rated -20°C to 400°C and suitable for natural gas, LPG, non-potable water and steam - a wider remit than the bayonet-connection hoses above. They're available in three bores, each in braided or unbraided finish: 1/2" (braided or unbraided), 3/4" (braided or unbraided) and 1" (braided or unbraided). Working pressure varies by bore, so always check the individual product specification for the exact figure rather than assuming one rating applies across the range.
Adaptors
Because the BSP swivel-connection hoses finish in a female swivel fitting, a brass adaptor is often needed to complete the joint to the appliance or pipework. The 1/2" Male/Male Adaptor suits the smaller bore hoses, and the Gas Hose Male Adaptors 3/4" to 3/4" BSP suits the 3/4" size. We recommend checking the hose's bore against the adaptor size before ordering, as they aren't universal.
Braided Or Unbraided?
The braided versions add an outer wire braid over the convoluted tube for extra mechanical protection against abrasion and knocks, which is worth choosing where the hose runs where it could be caught or rubbed - behind a cooker that gets pulled out for cleaning, for example. Unbraided hoses are lighter and more flexible where that extra protection isn't needed. Braiding doesn't change the bore, connection type or fuel suitability, only the outer protection.
Bayonet Or BSP Swivel Connection?
Choose based on what the hose is connecting to. A bayonet-connection hose is for a domestic cooker or appliance fitted with a matching wall bayonet socket, while a BSP swivel-connection hose suits installations with threaded pipework at both ends, including non-domestic and higher-temperature applications the bayonet range isn't rated for. If the existing installation already has one type of fitting, match the replacement hose to it rather than changing the connection type.
Installing A Steel Convoluted Hose
Any gas hose assembly connecting to a live gas supply should be fitted, and the connection tested, by a Gas Safe registered engineer. If a longer stainless convoluted hose is needed for a commercial catering installation, our double armoured hoses range includes a 10ft stainless convoluted option built to BS 669-2 for catering appliances, alongside our double-armoured range for even higher-protection installations. For other gas and LPG hose formats, including marine and caravan applications, browse our full hose assemblies range.
Steel Convoluted Hose FAQs
What is a steel convoluted hose used for?
It provides a flexible connection between a gas supply and an appliance where rigid pipework isn't suitable, such as when an appliance needs to be moved for cleaning or servicing, or when vibration needs to be absorbed rather than transmitted into fixed pipework.
What's the difference between the bayonet and BSP swivel-connection hoses?
The bayonet-connection hoses are designed for domestic cookers and appliances that plug into a wall bayonet socket, with a fixed 1/2" bore and a 50 mbar rating. The BSP swivel-connection hoses have threaded fittings at both ends, are available in 1/2", 3/4" and 1" bores, and are rated for a wider range of applications, including higher temperatures.
What does "braided" mean on these hoses?
It refers to an outer wire braid fitted over the convoluted tube for extra protection against abrasion and knocks. It doesn't affect the bore, connection type or which fuels the hose is rated for.
Do I need the adaptor as well as the hose?
Only if you're fitting a BSP swivel-connection hose and the pipework or appliance connection needs a male fitting rather than the hose's own female swivel end. The bayonet-connection hoses don't need one, since they connect directly to a bayonet socket.
Can these hoses be used for LPG as well as natural gas?
Yes, both the bayonet-connection and BSP swivel-connection ranges are rated for natural gas and LPG. The BSP swivel-connection range is also rated for non-potable water and steam.
Can I fit a steel convoluted hose myself?
Any hose connecting to a live gas supply should be fitted, and the connection tested, by a Gas Safe registered engineer, in line with current gas safety regulations.
What standard do these hoses meet?
They're built to BS EN ISO 10380:2003, the standard covering flexible metallic hose assemblies.