What gas fitting do I need for this?
Discussion
Afternoon all 
I've bought a Neff gas hob. There is already a gas feed in 15mm copper going to where the old hob was, but it needs to be changed slightly. The Neff hob came with one right angle connector already fitted to the underside of the hob, and a second loose right angle connector as shown below. Both connectors are exactly the same.
What type of fitting do I need to join the 15mm copper to the right angle connector on the underside of the hob? A standard compression connector for 15mm pipe has the same thread as the Neff right angle connector and the nut will tighten fine. However, Looking at the instructions the pipe going into the Neff connector must have a diameter of "MAX 12.4mm." 15mm copper pipe can be "joined" but it won't sit inside the right angle fitting. The walls of the right angle fitting appear to be thicker than the walls of a 15mm compression fitting:
I hope that makes sense? Basically a 15mm compression fitting will screw onto the right angle connector fine, but 15mm copper pipe is too big to sit inside the right angle connector.
I would prefer a flexible hose type connector if possible. Any advise (other than the mandatory "get a gas man in") will be much appreciated.
Thanks
I've bought a Neff gas hob. There is already a gas feed in 15mm copper going to where the old hob was, but it needs to be changed slightly. The Neff hob came with one right angle connector already fitted to the underside of the hob, and a second loose right angle connector as shown below. Both connectors are exactly the same.
What type of fitting do I need to join the 15mm copper to the right angle connector on the underside of the hob? A standard compression connector for 15mm pipe has the same thread as the Neff right angle connector and the nut will tighten fine. However, Looking at the instructions the pipe going into the Neff connector must have a diameter of "MAX 12.4mm." 15mm copper pipe can be "joined" but it won't sit inside the right angle fitting. The walls of the right angle fitting appear to be thicker than the walls of a 15mm compression fitting:
I hope that makes sense? Basically a 15mm compression fitting will screw onto the right angle connector fine, but 15mm copper pipe is too big to sit inside the right angle connector.
I would prefer a flexible hose type connector if possible. Any advise (other than the mandatory "get a gas man in") will be much appreciated.
Thanks
Toilet Duck said:
15mm copper pipe is too big to sit inside the right angle connector.
It's not a compression fitting. It isn't intended to take a 15mm pipe. You need a 15mm x 1/2" female iron. The two elbows SHOULDN'T be the same, one should have a tapered thread. You then need either a gas PTFE tape OR a jointing paste suitable for the correct family gas. Gas hobs should NEVER be fitted with a flexible hose. Once fitted you must commission the hob correctly to ensure it's operating on the correct pressure in conjunction with any additional loads from other appliances on the system.
Is your insurance up to date?
Edited by Arthur Jackson on Friday 24th June 16:46
Arthur Jackson said:
Is your insurance up to date?
As I was plummeting helplessly to earth, both parachutes having failed, I was surprised to see a man coming up towards me. As we approached I shouted to him 'Do you know anything about parachutes?' 'No' he shouted as he went past, 'Do you know anything about gas cookers?' LFB531 said:
12mm copper pipe is widely available as are 15mm x 12mm reducers and collared tubes deigned for the job
OK cool, I shall have a look. Cheers LFB531 said:
you should of course get a gas man in!
I'm not paying someone to tighten up a couple of nuts. If I needed a new boiler or the main gas feed moving etc then that would be an entirely different story. Arthur Jackson said:
You need a 15mm x 1/2" female iron.
Cheers Arthur Jackson said:
The two elbows SHOULDN'T be the same, one should have a tapered thread.
They are 100% identical. I removed the plastic push on protective cap fitted to the fitting on the underside of the cooker and it is not tapered.Arthur Jackson said:
You then need either a gas PTFE tape OR a jointing paste suitable for the correct family gas.
Already got the PTFE tape (gas type, not water)Arthur Jackson said:
Gas hobs should NEVER be fitted with a flexible hose.
Why is this? What makes it safe to use flexible hoses to connect up cookers?Thanks all
Odd you have two the same, this is obviously wrong. You can still wind a female iron onto the parallel thread, but ensure it holds on a tightness test.
You can use a flexible hose on a MOVEABLE cooker, but a FIXED appliance must be RIGIDLY plumbed. In this way the installation complies with the appropriate BS Document. Running pressure is important for this too.
You can use a flexible hose on a MOVEABLE cooker, but a FIXED appliance must be RIGIDLY plumbed. In this way the installation complies with the appropriate BS Document. Running pressure is important for this too.
Arthur Jackson said:
Odd you have two the same, this is obviously wrong. You can still wind a female iron onto the parallel thread, but ensure it holds on a tightness test.
Interesting, thanks.Arthur Jackson said:
You can use a flexible hose on a MOVEABLE cooker, but a FIXED appliance must be RIGIDLY plumbed. In this way the installation complies with the appropriate BS Document. Running pressure is important for this too.
Ah OK, so no kittens would actually die if you used a flexible hose. 
Thanks again
dirkgently said:
That`s not all there is to it, and you seem to be having trouble with that.
Lol 
If I can get the information I need, I will attempt the job. If I can't/don't have the tools/job is too dangerous then I won't and I'll pay someone to do it. I thought I would get some PH expert advice rather than connect it up with whatever old fittings I have knocking round and a length of spare garden hose, sealed with gaffer tape and plumbers mate
Toilet Duck said:
Lol
If I can ............ I would get some PH expert advice rather than connect it up with whatever old fittings I have knocking round and a length of spare garden hose, sealed with gaffer tape and plumbers mate
Sounds to me as if you're a fully trained Corgi Gas Safe cowboy like the rest of 'em. If I can ............ I would get some PH expert advice rather than connect it up with whatever old fittings I have knocking round and a length of spare garden hose, sealed with gaffer tape and plumbers mate
Take the elbow to your local Plumb Centre and they'll sell you the bits you need then it's just a case of common sense.
Go for it buddy, even rocket science ain't rocket science anymore.
Arthur Jackson said:
LOL!!!
Shall we try an experiment...
asbestos compensation claims
Anyone can do gas work in their own home.
However, they must be competent.
If any of your work should cause danger or you blow up your house along with your next door neighbours, your sir, are in the s
t goo and deep.
Plus, unless the new hob is registered via a registered gas installer, your warranty is void.
Good luck, and dont forget to prey for your family.
However, they must be competent.
If any of your work should cause danger or you blow up your house along with your next door neighbours, your sir, are in the s
t goo and deep.Plus, unless the new hob is registered via a registered gas installer, your warranty is void.
Good luck, and dont forget to prey for your family.
ghamer said:
Jesus,would,nt like to live next door to this guy.Been a gas engineer for 20years now and I see a lot of this every day.People who are prepared to blow up themselves their family and neighbours for a few quid.Still,keeps me in a job!
Out of interest how many gas explosions have you witnessed and how many people have you seen blown up? Gassing Station | Homes, Gardens and DIY | Top of Page | What's New | My Stuff